diff --git a/src/os_win32.c b/src/os_win32.c
index e5cfac7..dbfc4ee 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -7443,7 +7443,7 @@
 	{
 	    int l = 2;
 
-	    if (isdigit(s[l]))
+	    if (SAFE_isdigit(s[l]))
 		l++;
 	    if (s[l] == ' ' && s[l + 1] == 'q')
 	    {