diff --git a/core/os/path_windows.odin b/core/os/path_windows.odin
index 98e26f929..83100ad69 100644
--- a/core/os/path_windows.odin
+++ b/core/os/path_windows.odin
@@ -349,7 +349,7 @@ _get_common_path_len :: proc(base, target: string) -> int {
 	end := min(len(base), len(target))
 	for j in 0..=end {
 		if j == end || _is_path_separator(base[j]) {
-			if _is_path_separator(base[i]) && _is_path_separator(target[i]) {
+			if i < end && _is_path_separator(base[i]) && _is_path_separator(target[i]) {
 				i += 1
 			}
 			if strings.equal_fold(base[i:j], target[i:j]) {