diff --git a/src/os_win32.c b/src/os_win32.c
index ff60e04..7891944 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -5788,7 +5788,7 @@
 		*((WCHAR*)gap->ga_data + gap->ga_len++) = *p;
 	    p++;
 	}
-	FreeEnvironmentStrings(base);
+	FreeEnvironmentStringsW(base);
 	*((WCHAR*)gap->ga_data + gap->ga_len++) = L'\0';
     }