diff --git a/src/sigar_ptql.c b/src/sigar_ptql.c
index 11b54837..9d4178a1 100644
--- a/src/sigar_ptql.c
+++ b/src/sigar_ptql.c
@@ -21,6 +21,10 @@
 #include "sigar_util.h"
 #include "sigar_ptql.h"
 
+#ifdef WIN32
+#define strtoull strtoul /*XXX*/
+#endif
+
 /* XXX need more specific errors */
 #define SIGAR_PTQL_MALFORMED_QUERY 1