diff --git a/services/inputflinger/dispatcher/InputDispatcher.cpp b/services/inputflinger/dispatcher/InputDispatcher.cpp
index cd427f0..5ea543f 100644
--- a/services/inputflinger/dispatcher/InputDispatcher.cpp
+++ b/services/inputflinger/dispatcher/InputDispatcher.cpp
@@ -31,6 +31,7 @@
 #endif
 #include <input/InputDevice.h>
 #include <input/PrintTools.h>
+#include <openssl/mem.h>
 #include <powermanager/PowerManager.h>
 #include <unistd.h>
 #include <utils/Trace.h>
@@ -4629,7 +4630,7 @@
     if (calculatedHmac == INVALID_HMAC) {
         return nullptr;
     }
-    if (calculatedHmac != event.getHmac()) {
+    if (0 != CRYPTO_memcmp(calculatedHmac.data(), event.getHmac().data(), calculatedHmac.size())) {
         return nullptr;
     }
     return result;