diff --git a/win32/build/config.w32 b/win32/build/config.w32
index 6841f435e6f..6b4e1736cd7 100644
--- a/win32/build/config.w32
+++ b/win32/build/config.w32
@@ -23,7 +23,7 @@ function probe_binary(EXE, what)
 			return 1;
 		}
 	} else {
-		if (version.match(/(\d+\.\d+\.\d+(\.\d+)?)/)) {
+		if (version.match(/(\d+\.\d+(\.\d+)?(\.\d+)?)/)) {
 			return RegExp.$1;
 		}
 	}