diff --git a/camera/CameraParameters.cpp b/camera/CameraParameters.cpp
index c51f265..af091f4 100644
--- a/camera/CameraParameters.cpp
+++ b/camera/CameraParameters.cpp
@@ -470,7 +470,7 @@
     const size_t SIZE = 256;
     char buffer[SIZE];
     String8 result;
-    snprintf(buffer, 255, "CameraParameters::dump: mMap.size = %d\n", mMap.size());
+    snprintf(buffer, 255, "CameraParameters::dump: mMap.size = %zu\n", mMap.size());
     result.append(buffer);
     for (size_t i = 0; i < mMap.size(); i++) {
         String8 k, v;