diff --git a/strgen/strgen.c b/strgen/strgen.c
--- a/strgen/strgen.c
+++ b/strgen/strgen.c
@@ -1311,7 +1311,12 @@ int CDECL main(int argc, char* argv[])
 		if (_errors) return 1;
 
 		/* get the targetfile, strip any directories and append to destination path */
+#if defined(__MINGW32__) || defined (__CYGWIN__)
+		/* Under mingw32 and cygwin, we enter / via the Makefile, not the expected \ */
+		r = strrchr(argv[1], "/");
+#else
 		r = strrchr(argv[1], PATHSEPCHAR);
+#endif
 		mkpath(pathbuf, lengthof(pathbuf), dest_dir, (r != NULL) ? &r[1] : argv[1]);
 
 		/* rename the .txt (input-extension) to .lng */