diff --git a/src/if_python.c b/src/if_python.c
index 02dc8ed..34a75a6 100644
--- a/src/if_python.c
+++ b/src/if_python.c
@@ -613,7 +613,7 @@
 #  endif
 # endif
 # if defined(PY_VERSION_HEX) && PY_VERSION_HEX >= 0x02050000 \
-	&& SIZEOF_SIZE_T != SIZEOF_INT
+	&& SIZEOF_SIZE_T != VIM_SIZEOF_INT
 #  ifdef Py_DEBUG
     {"Py_InitModule4TraceRefs_64", (PYTHON_PROC*)&dll_Py_InitModule4},
 #  else