diff --git a/crnlib/crn_packed_uint.h b/crnlib/crn_packed_uint.h
index df55e6b4..dedca4ae 100644
--- a/crnlib/crn_packed_uint.h
+++ b/crnlib/crn_packed_uint.h
@@ -39,7 +39,7 @@ struct packed_uint {
   }
 
   inline operator unsigned int() const {
-    switch (sizeof(m_buf)) {
+    switch (sizeof(m_buf) / sizeof(m_buf[0])) {
       case 1:
         return m_buf[0];
       case 2:
diff --git a/inc/crn_defs.h b/inc/crn_defs.h
index 0f41c0eb..0a457ccb 100644
--- a/inc/crn_defs.h
+++ b/inc/crn_defs.h
@@ -225,7 +225,7 @@ struct crn_packed_uint {
   }
 
   inline operator unsigned int() const {
-    switch (sizeof(m_buf)) {
+    switch (sizeof(m_buf) / sizeof(m_buf[0])) {
       case 1:
         return m_buf[0];
       case 2: