diff --git a/android/jni/app-android.cpp b/android/jni/app-android.cpp
index e5e557557b..12d87c0930 100644
--- a/android/jni/app-android.cpp
+++ b/android/jni/app-android.cpp
@@ -384,7 +384,7 @@ void System_ShowKeyboard() {
 
 void System_Vibrate(int length_ms) {
 	char temp[32];
-	snprintf(temp, sizeof(temp), "%", length_ms);
+	snprintf(temp, sizeof(temp), "%d", length_ms);
 	PushCommand("vibrate", temp);
 }