diff --git a/java/rocksjni/portal.h b/java/rocksjni/portal.h
index b46ac65549..20b446863b 100644
--- a/java/rocksjni/portal.h
+++ b/java/rocksjni/portal.h
@@ -211,8 +211,7 @@ class WriteBatchJni {
 class HistogramDataJni {
  public:
   static jmethodID getConstructorMethodId(JNIEnv* env, jclass jclazz) {
-    jmethodID mid = env->GetMethodID(
-        jclazz, "<init>", "(DDDDD)V");
+    static jmethodID mid = env->GetMethodID(jclazz, "<init>", "(DDDDD)V");
     assert(mid != nullptr);
     return mid;
   }