diff --git a/php/ext/google/protobuf/php-upb.h b/php/ext/google/protobuf/php-upb.h
index e2c35bb45e..88cacad5f1 100644
--- a/php/ext/google/protobuf/php-upb.h
+++ b/php/ext/google/protobuf/php-upb.h
@@ -772,7 +772,7 @@ UPB_API_INLINE void* upb_Arena_Realloc(upb_Arena* a, void* ptr, size_t oldsize,
 // this was not the last alloc.
 UPB_API_INLINE void upb_Arena_ShrinkLast(upb_Arena* a, void* ptr,
                                          size_t oldsize, size_t size) {
-  return UPB_PRIVATE(_upb_Arena_ShrinkLast)(a, ptr, oldsize, size);
+  UPB_PRIVATE(_upb_Arena_ShrinkLast)(a, ptr, oldsize, size);
 }
 
 #ifdef __cplusplus
@@ -1753,7 +1753,7 @@ UPB_API_INLINE const upb_MiniTable* upb_MiniTableExtension_GetSubMessage(
 
 UPB_API_INLINE void upb_MiniTableExtension_SetSubMessage(
     upb_MiniTableExtension* e, const upb_MiniTable* m) {
-  return UPB_PRIVATE(_upb_MiniTableExtension_SetSubMessage)(e, m);
+  UPB_PRIVATE(_upb_MiniTableExtension_SetSubMessage)(e, m);
 }
 
 #ifdef __cplusplus
diff --git a/ruby/ext/google/protobuf_c/ruby-upb.h b/ruby/ext/google/protobuf_c/ruby-upb.h
index 0bc527b44c..f7525163fa 100755
--- a/ruby/ext/google/protobuf_c/ruby-upb.h
+++ b/ruby/ext/google/protobuf_c/ruby-upb.h
@@ -774,7 +774,7 @@ UPB_API_INLINE void* upb_Arena_Realloc(upb_Arena* a, void* ptr, size_t oldsize,
 // this was not the last alloc.
 UPB_API_INLINE void upb_Arena_ShrinkLast(upb_Arena* a, void* ptr,
                                          size_t oldsize, size_t size) {
-  return UPB_PRIVATE(_upb_Arena_ShrinkLast)(a, ptr, oldsize, size);
+  UPB_PRIVATE(_upb_Arena_ShrinkLast)(a, ptr, oldsize, size);
 }
 
 #ifdef __cplusplus
@@ -1755,7 +1755,7 @@ UPB_API_INLINE const upb_MiniTable* upb_MiniTableExtension_GetSubMessage(
 
 UPB_API_INLINE void upb_MiniTableExtension_SetSubMessage(
     upb_MiniTableExtension* e, const upb_MiniTable* m) {
-  return UPB_PRIVATE(_upb_MiniTableExtension_SetSubMessage)(e, m);
+  UPB_PRIVATE(_upb_MiniTableExtension_SetSubMessage)(e, m);
 }
 
 #ifdef __cplusplus