diff --git a/soundtrigger/2.0/default/SoundTriggerHalImpl.cpp b/soundtrigger/2.0/default/SoundTriggerHalImpl.cpp
index afda739..b0aef4b 100644
--- a/soundtrigger/2.0/default/SoundTriggerHalImpl.cpp
+++ b/soundtrigger/2.0/default/SoundTriggerHalImpl.cpp
@@ -138,7 +138,7 @@
         } while (mClients.valueFor(*modelId) != 0 && *modelId != 0);
     }
     LOG_ALWAYS_FATAL_IF(*modelId == 0,
-                        "wrap around in sound model IDs, num loaded models %d", mClients.size());
+                        "wrap around in sound model IDs, num loaded models %zu", mClients.size());
 
     client = new SoundModelClient(*modelId, callback, cookie);