diff --git a/include/cudaq/Optimizer/Dialect/Quake/QuakeTypes.td b/include/cudaq/Optimizer/Dialect/Quake/QuakeTypes.td
index 2e6fc9dfe3..7dd31469fd 100644
--- a/include/cudaq/Optimizer/Dialect/Quake/QuakeTypes.td
+++ b/include/cudaq/Optimizer/Dialect/Quake/QuakeTypes.td
@@ -150,7 +150,6 @@ def VeqType : QuakeType<"Veq", "veq"> {
 
   let parameters = (ins "std::size_t":$size);
 
-  let genVerifyDecl = 1;
   let hasCustomAssemblyFormat = 1;
   
   let extraClassDeclaration = [{
@@ -177,8 +176,10 @@ def StruqType : QuakeType<"Struq", "struq"> {
 
   let parameters = (ins
     "mlir::StringAttr":$name,
+    // members must be NonStruqRefType.
     ArrayRefParameter<"mlir::Type">:$members
   );
+
   let hasCustomAssemblyFormat = 1;
 
   let extraClassDeclaration = [{
diff --git a/lib/Optimizer/Dialect/Quake/QuakeOps.cpp b/lib/Optimizer/Dialect/Quake/QuakeOps.cpp
index e3d9ab13d1..b4185c2a1e 100644
--- a/lib/Optimizer/Dialect/Quake/QuakeOps.cpp
+++ b/lib/Optimizer/Dialect/Quake/QuakeOps.cpp
@@ -162,6 +162,16 @@ LogicalResult quake::AllocaOp::verify() {
         return emitOpError("size operand required");
       }
     }
+  } else {
+    // Size has no semantics for any type other than quake.veq.
+    if (getSize())
+      return emitOpError("cannot specify size with this quantum type");
+
+    if (auto stqTy = dyn_cast<StruqType>(getResult().getType()))
+      for (auto t : stqTy.getMembers())
+        if (auto vt = dyn_cast<VeqType>(t))
+          if (!vt.hasSpecifiedSize())
+            return emitOpError("struq type must have specified size");
   }
 
   // Check the uses. If any use is a InitializeStateOp, then it must be the only
diff --git a/lib/Optimizer/Dialect/Quake/QuakeTypes.cpp b/lib/Optimizer/Dialect/Quake/QuakeTypes.cpp
index 959a869fe5..c4eb8faee1 100644
--- a/lib/Optimizer/Dialect/Quake/QuakeTypes.cpp
+++ b/lib/Optimizer/Dialect/Quake/QuakeTypes.cpp
@@ -49,13 +49,6 @@ Type quake::VeqType::parse(AsmParser &parser) {
   return get(parser.getContext(), size);
 }
 
-LogicalResult
-quake::VeqType::verify(llvm::function_ref<InFlightDiagnostic()> emitError,
-                       std::size_t size) {
-  // FIXME: Do we want to check the size of the veq for some bound?
-  return success();
-}
-
 //===----------------------------------------------------------------------===//
 
 Type quake::StruqType::parse(AsmParser &parser) {
@@ -77,6 +70,9 @@ Type quake::StruqType::parse(AsmParser &parser) {
       break;
     if (!succeeded(*optTy))
       return {};
+    if (!llvm::isa<quake::RefType, quake::VeqType>(member))
+      parser.emitError(parser.getCurrentLocation(),
+                       "invalid struq member type");
     members.push_back(member);
   } while (succeeded(parser.parseOptionalComma()));
   if (parser.parseGreater())
diff --git a/test/Quake/invalid.qke b/test/Quake/invalid.qke
index 1dd79e84c0..45fa797f57 100644
--- a/test/Quake/invalid.qke
+++ b/test/Quake/invalid.qke
@@ -12,6 +12,7 @@ func.func @test_struq() {
   %0 = quake.alloca !quake.veq<4>
   %1 = arith.constant 1 : i32
   %2 = arith.constant 2.0 : f32
+  // expected-error@+2 {{invalid struq member type}}
   // expected-error@+1 {{must be non-struct quantum reference type}}
   %6 = quake.make_struq %0, %1, %2 : (!quake.veq<4>, i32, f32) -> !quake.struq<!quake.veq<?>, i32, f32>
   return
@@ -54,3 +55,19 @@ func.func @test_struq(%arg : !quake.struq<!quake.veq<1>, !quake.veq<2>, !quake.v
   %6 = quake.get_member %arg[3] : (!quake.struq<!quake.veq<1>, !quake.veq<2>, !quake.veq<3>>) -> !quake.veq<1>
   return
 }
+
+// -----
+
+func.func @test_struq() {
+  // expected-error@+1 {{struq type must have specified size}}
+  %0 = quake.alloca !quake.struq<!quake.veq<1>, !quake.veq<?>>
+  return
+}
+
+// -----
+
+func.func @test_struq() {
+  // expected-error@+1 {{invalid struq member type}}
+  %0 = quake.alloca !quake.struq<!quake.struq<!quake.veq<3>, !quake.ref>, !quake.veq<7>>
+  return
+}
diff --git a/test/Quake/roundtrip-ops.qke b/test/Quake/roundtrip-ops.qke
index 2d094e4060..c73685d9b8 100644
--- a/test/Quake/roundtrip-ops.qke
+++ b/test/Quake/roundtrip-ops.qke
@@ -818,6 +818,7 @@ func.func @quantum_product_type() {
   %22 = quake.make_struq %20, %21 : (!quake.veq<7>, !quake.veq<8>) -> !quake.struq<!quake.veq<7>, !quake.veq<8>>
   %23 = quake.get_member %22[0] : (!quake.struq<!quake.veq<7>, !quake.veq<8>>) -> !quake.veq<7>
   %24 = quake.get_member %22[1] : (!quake.struq<!quake.veq<7>, !quake.veq<8>>) -> !quake.veq<8>
+  %25 = quake.alloca !quake.struq<!quake.veq<8>, !quake.veq<5>>
   return
  }
 
@@ -837,5 +838,6 @@ func.func @quantum_product_type() {
 // CHECK:           %[[VAL_12:.*]] = quake.make_struq %[[VAL_10]], %[[VAL_11]] : (!quake.veq<7>, !quake.veq<8>) -> !quake.struq<!quake.veq<7>, !quake.veq<8>>
 // CHECK:           %[[VAL_13:.*]] = quake.get_member %[[VAL_12]][0] : (!quake.struq<!quake.veq<7>, !quake.veq<8>>) -> !quake.veq<7>
 // CHECK:           %[[VAL_14:.*]] = quake.get_member %[[VAL_12]][1] : (!quake.struq<!quake.veq<7>, !quake.veq<8>>) -> !quake.veq<8>
+// CHECK:           %[[VAL_15:.*]] = quake.alloca !quake.struq<!quake.veq<8>, !quake.veq<5>>
 // CHECK:           return
 // CHECK:         }