diff --git a/services/inputflinger/dispatcher/InputDispatcher.cpp b/services/inputflinger/dispatcher/InputDispatcher.cpp
index b9cb4ad..0f18830 100644
--- a/services/inputflinger/dispatcher/InputDispatcher.cpp
+++ b/services/inputflinger/dispatcher/InputDispatcher.cpp
@@ -27,6 +27,7 @@
 #include <ftl/enum.h>
 #include <gui/SurfaceComposerClient.h>
 #include <input/InputDevice.h>
+#include <openssl/mem.h>
 #include <powermanager/PowerManager.h>
 #include <unistd.h>
 #include <utils/Trace.h>
@@ -4454,7 +4455,7 @@
     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;