diff --git a/include/freetype/internal/ftmemory.h b/include/freetype/internal/ftmemory.h
index 202cd0a7f..4e05a29f1 100644
--- a/include/freetype/internal/ftmemory.h
+++ b/include/freetype/internal/ftmemory.h
@@ -371,8 +371,11 @@ extern "C++"
 #define FT_STRDUP( dst, str )                           \
           FT_MEM_SET_ERROR( FT_MEM_STRDUP( dst, str ) )
 
-#define FT_MEM_DUP( dst, address, size )                                    \
-          (dst) = ft_mem_dup( memory, (address), (FT_ULong)(size), &error )
+#define FT_MEM_DUP( dst, address, size )                       \
+          FT_ASSIGNP_INNER( dst, ft_mem_dup( memory,           \
+                                             (address),        \
+                                             (FT_ULong)(size), \
+                                             &error ) )
 
 #define FT_DUP( dst, address, size )                           \
           FT_MEM_SET_ERROR( FT_MEM_DUP( dst, address, size ) )