diff --git a/src/windows-cmdline-wrapper.c b/src/windows-cmdline-wrapper.c
index 704e2d7..7299ab2 100644
--- a/src/windows-cmdline-wrapper.c
+++ b/src/windows-cmdline-wrapper.c
@@ -62,7 +62,7 @@ int main(int argc, char *argv[])
         // We expect our helper to end with .com
         assert(strncmp(name + len - 3, "com", 4) == 0);
         // replace .com with .exe
-        strncpy(name + len - 3, "exe", 3);
+        memcpy(name + len - 3, "exe", 3);
     }
 
     si.cb = sizeof(si);