diff --git a/src/string.cpp b/src/string.cpp
index 6eac4f53b..9d7ff7b89 100644
--- a/src/string.cpp
+++ b/src/string.cpp
@@ -205,7 +205,7 @@ gb_internal gb_inline isize string_extension_position(String const &str) {
 	isize dot_pos = -1;
 	isize i = str.len;
 	while (i --> 0) {
-		if (str[i] == GB_PATH_SEPARATOR)
+		if (str[i] == '\\' || str[i] == '/')
 			break;
 		if (str[i] == '.') {
 			dot_pos = i;