diff --git a/inst/include/ergm_dyadgen.h b/inst/include/ergm_dyadgen.h
index 3e50a4c6b..bd44082fa 100644
--- a/inst/include/ergm_dyadgen.h
+++ b/inst/include/ergm_dyadgen.h
@@ -47,8 +47,8 @@ DyadGen *DyadGenInitialize(DyadGenType type, void *dyads, void *track_nwp);
 DyadGen *DyadGenInitializeR(SEXP pR, void *any_nwp, Rboolean el);
 void DyadGenDestroy(DyadGen *gen);
 
-void DyadGenUpdate(Vertex tail, Vertex head, DyadGen *gen, Network *nwp, Rboolean edgestate);
-void WtDyadGenUpdate(Vertex tail, Vertex head, double weight, DyadGen *gen, WtNetwork *nwp, double edgestate);
+void DyadGenUpdate(Vertex tail, Vertex head, void *gen, Network *nwp, Rboolean edgestate);
+void WtDyadGenUpdate(Vertex tail, Vertex head, double weight, void *gen, WtNetwork *nwp, double edgestate);
 
 static inline void DyadGenRandDyad(Vertex *tail, Vertex *head, DyadGen *gen){
   switch(gen->type){
diff --git a/inst/include/ergm_stubs.c b/inst/include/ergm_stubs.c
index ed63fd9e4..dfd02c666 100644
--- a/inst/include/ergm_stubs.c
+++ b/inst/include/ergm_stubs.c
@@ -67,14 +67,14 @@ static void (*fun)(DyadGen *) = NULL;
 if(fun==NULL) fun = (void (*)(DyadGen *)) R_FindSymbol("DyadGenDestroy", "ergm", NULL);
 fun(gen);
 }
-void DyadGenUpdate(Vertex tail, Vertex head, DyadGen *gen, Network *nwp, Rboolean edgestate){
-static void (*fun)(Vertex,Vertex,DyadGen *,Network *,Rboolean) = NULL;
-if(fun==NULL) fun = (void (*)(Vertex,Vertex,DyadGen *,Network *,Rboolean)) R_FindSymbol("DyadGenUpdate", "ergm", NULL);
+void DyadGenUpdate(Vertex tail, Vertex head, void *gen, Network *nwp, Rboolean edgestate){
+static void (*fun)(Vertex,Vertex,void *,Network *,Rboolean) = NULL;
+if(fun==NULL) fun = (void (*)(Vertex,Vertex,void *,Network *,Rboolean)) R_FindSymbol("DyadGenUpdate", "ergm", NULL);
 fun(tail,head,gen,nwp,edgestate);
 }
-void WtDyadGenUpdate(Vertex tail, Vertex head, double weight, DyadGen *gen, WtNetwork *nwp, double edgestate){
-static void (*fun)(Vertex,Vertex,double,DyadGen *,WtNetwork *,double) = NULL;
-if(fun==NULL) fun = (void (*)(Vertex,Vertex,double,DyadGen *,WtNetwork *,double)) R_FindSymbol("WtDyadGenUpdate", "ergm", NULL);
+void WtDyadGenUpdate(Vertex tail, Vertex head, double weight, void *gen, WtNetwork *nwp, double edgestate){
+static void (*fun)(Vertex,Vertex,double,void *,WtNetwork *,double) = NULL;
+if(fun==NULL) fun = (void (*)(Vertex,Vertex,double,void *,WtNetwork *,double)) R_FindSymbol("WtDyadGenUpdate", "ergm", NULL);
 fun(tail,head,weight,gen,nwp,edgestate);
 }
 
diff --git a/src/MHproposal.c b/src/MHproposal.c
index 92ade9cb8..a81506d64 100644
--- a/src/MHproposal.c
+++ b/src/MHproposal.c
@@ -11,6 +11,10 @@
 #include "ergm_changestat.h"
 #include "ergm_Rutil.h"
 
+void OnNetworkEdgeChangeMUWrap(Vertex tail, Vertex head, void *MHp, Network *nwp, Rboolean edgestate){
+  ((MHProposal *) MHp)->u_func(tail, head, MHp, nwp, edgestate);
+}
+
 /*********************
  void MHProposalInitialize
 
@@ -91,7 +95,7 @@ MHProposal *MHProposalInitialize(SEXP pR, Network *nwp, void **aux_storage){
   MHp->togglehead = (Vertex *)R_Calloc(MHp->ntoggles, Vertex);
 
   if(MHp->u_func){
-    AddOnNetworkEdgeChange(nwp, (OnNetworkEdgeChange) MHp->u_func, MHp, 0); // Need to insert at the start.
+    AddOnNetworkEdgeChange(nwp, OnNetworkEdgeChangeMUWrap, MHp, 0); // Need to insert at the start.
   }
 
   return MHp;
@@ -104,7 +108,7 @@ MHProposal *MHProposalInitialize(SEXP pR, Network *nwp, void **aux_storage){
 *********************/
 void MHProposalDestroy(MHProposal *MHp, Network *nwp){
   if(!MHp) return;
-  if(MHp->u_func) DeleteOnNetworkEdgeChange(nwp, (OnNetworkEdgeChange) MHp->u_func, MHp);
+  if(MHp->u_func) DeleteOnNetworkEdgeChange(nwp, OnNetworkEdgeChangeMUWrap, MHp);
   if(MHp->f_func) (*(MHp->f_func))(MHp, nwp);
   if(MHp->storage){
     R_Free(MHp->storage);
diff --git a/src/ergm_dyadgen.c b/src/ergm_dyadgen.c
index 1b873079f..9cde2cf39 100644
--- a/src/ergm_dyadgen.c
+++ b/src/ergm_dyadgen.c
@@ -173,7 +173,8 @@ void DyadGenDestroy(DyadGen *gen){
 }
 
 
-void DyadGenUpdate(Vertex tail, Vertex head, DyadGen *gen, Network *nwp, Rboolean edgestate){
+void DyadGenUpdate(Vertex tail, Vertex head, void *payload, Network *nwp, Rboolean edgestate){
+  DyadGen *gen = payload;
   if(gen->sleeping) return;
 
   switch(gen->intertype){
@@ -193,7 +194,8 @@ void DyadGenUpdate(Vertex tail, Vertex head, DyadGen *gen, Network *nwp, Rboolea
 }
 
 
-void WtDyadGenUpdate(Vertex tail, Vertex head, double weight, DyadGen *gen, WtNetwork *nwp, double edgestate){
+void WtDyadGenUpdate(Vertex tail, Vertex head, double weight, void *payload, WtNetwork *nwp, double edgestate){
+  DyadGen *gen = payload;
   if(gen->sleeping) return;
 
   switch(gen->intertype){
diff --git a/src/model.c b/src/model.c
index 084dc6fab..05f26cc3a 100644
--- a/src/model.c
+++ b/src/model.c
@@ -12,6 +12,10 @@
 #include "ergm_omp.h"
 #include "ergm_util.h"
 
+void OnNetworkEdgeChangeUWrap(Vertex tail, Vertex head, void *mtp, Network *nwp, Rboolean edgestate){
+  ((ModelTerm *) mtp)->u_func(tail, head, mtp, nwp, edgestate);
+}
+
 /*
   InitStats
   A helper's helper function to initialize storage for functions that use it.
@@ -56,7 +60,7 @@ static inline void InitStats(Network *nwp, Model *m){
       }
       // Now, bind the term to the network through the callback API.
       if(mtp->u_func && (!m->noinit_s || !mtp->s_func)) // Skip if noinit_s is set and s_func is present.
-        AddOnNetworkEdgeChange(nwp, (OnNetworkEdgeChange) mtp->u_func, mtp, on_edge_change_pos);
+        AddOnNetworkEdgeChange(nwp, OnNetworkEdgeChangeUWrap, mtp, on_edge_change_pos);
     });
 }
 
@@ -69,7 +73,7 @@ static inline void DestroyStats(Network *nwp, Model *m){
   EXEC_THROUGH_TERMS(m, {
       if(!m->noinit_s || !mtp->s_func){ // Skip if noinit_s is set and s_func is present.
         if(mtp->u_func)
-          DeleteOnNetworkEdgeChange(nwp, (OnNetworkEdgeChange) mtp->u_func, mtp);
+          DeleteOnNetworkEdgeChange(nwp, OnNetworkEdgeChangeUWrap, mtp);
         if(mtp->f_func)
           (*(mtp->f_func))(mtp, nwp);  /* Call f_??? function */
       }
diff --git a/src/wtMHproposal.c b/src/wtMHproposal.c
index 1222c6d05..b2d95f8d3 100644
--- a/src/wtMHproposal.c
+++ b/src/wtMHproposal.c
@@ -10,6 +10,10 @@
 #include "ergm_wtMHproposal.h"
 #include "ergm_Rutil.h"
 
+void OnWtNetworkEdgeChangeMUWrap(Vertex tail, Vertex head, double weight, void *MHp, WtNetwork *nwp, double edgestate){
+  ((WtMHProposal *) MHp)->u_func(tail, head, weight, MHp, nwp, edgestate);
+}
+
 /*********************
  void WtMHProposalInitialize
 
@@ -92,7 +96,7 @@ WtMHProposal *WtMHProposalInitialize(SEXP pR, WtNetwork *nwp, void **aux_storage
   MHp->toggleweight = (double *)R_Calloc(MHp->ntoggles, double);
 
   if(MHp->u_func){
-    AddOnWtNetworkEdgeChange(nwp, (OnWtNetworkEdgeChange) MHp->u_func, MHp, 0); // Need to insert at the start.
+    AddOnWtNetworkEdgeChange(nwp, OnWtNetworkEdgeChangeMUWrap, MHp, 0); // Need to insert at the start.
   }
 
   return MHp;
@@ -105,7 +109,7 @@ WtMHProposal *WtMHProposalInitialize(SEXP pR, WtNetwork *nwp, void **aux_storage
 *********************/
 void WtMHProposalDestroy(WtMHProposal *MHp, WtNetwork *nwp){
   if(!MHp) return;
-  if(MHp->u_func) DeleteOnWtNetworkEdgeChange(nwp, (OnWtNetworkEdgeChange) MHp->u_func, MHp);
+  if(MHp->u_func) DeleteOnWtNetworkEdgeChange(nwp, OnWtNetworkEdgeChangeMUWrap, MHp);
   if(MHp->f_func) (*(MHp->f_func))(MHp, nwp);
   if(MHp->storage){
     R_Free(MHp->storage);
diff --git a/src/wtmodel.c b/src/wtmodel.c
index 47c6ddb74..6cbef370d 100644
--- a/src/wtmodel.c
+++ b/src/wtmodel.c
@@ -12,6 +12,10 @@
 #include "ergm_omp.h"
 #include "ergm_util.h"
 
+void OnWtNetworkEdgeChangeUWrap(Vertex tail, Vertex head, double weight, void *mtp, WtNetwork *nwp, double edgestate){
+  ((WtModelTerm *) mtp)->u_func(tail, head, weight, mtp, nwp, edgestate);
+}
+
 /*
   WtInitStats
   A helper's helper function to initialize storage for functions that use it.
@@ -56,7 +60,7 @@ static inline void WtInitStats(WtNetwork *nwp, WtModel *m){
       }
       // Now, bind the term to the network through the callback API.
       if(mtp->u_func && (!m->noinit_s || !mtp->s_func)) // Skip if noinit_s is set and s_func is present.
-        AddOnWtNetworkEdgeChange(nwp, (OnWtNetworkEdgeChange) mtp->u_func, mtp, on_edge_change_pos);
+        AddOnWtNetworkEdgeChange(nwp, OnWtNetworkEdgeChangeUWrap, mtp, on_edge_change_pos);
     });
 }
 
@@ -69,7 +73,7 @@ static inline void WtDestroyStats(WtNetwork *nwp, WtModel *m){
   WtEXEC_THROUGH_TERMS(m, {
       if(!m->noinit_s || !mtp->s_func){ // Skip if noinit_s is set and s_func is present.
         if(mtp->u_func)
-          DeleteOnWtNetworkEdgeChange(nwp, (OnWtNetworkEdgeChange) mtp->u_func, mtp);
+          DeleteOnWtNetworkEdgeChange(nwp, OnWtNetworkEdgeChangeUWrap, mtp);
         if(mtp->f_func)
           (*(mtp->f_func))(mtp, nwp);  /* Call f_??? function */
       }