diff --git a/reactos/include/snmp.h b/reactos/include/snmp.h
index 71bfb61dc4f..55b6a1fee41 100644
--- a/reactos/include/snmp.h
+++ b/reactos/include/snmp.h
@@ -115,7 +115,7 @@ typedef struct {
 
 #define SNMPAPI INT
 #ifndef SNMP_FUNC_TYPE
-#define SNMP_FUNC_TYPE
+#define SNMP_FUNC_TYPE	STDCALL
 #endif
 
 //LPVOID SNMP_FUNC_TYPE SnmpUtilMemAlloc(UINT nBytes);