diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 242c9ba..8c7c830 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -3319,7 +3319,7 @@
                             lastWriteFinished,previousLastWriteFinished, &deltaNs);
                         const int32_t deltaMs = deltaNs / 1000000;
 
-                        const int32_t throttleMs = mHalfBufferMs - deltaMs;
+                        const int32_t throttleMs = (int32_t)mHalfBufferMs - deltaMs;
                         if ((signed)mHalfBufferMs >= throttleMs && throttleMs > 0) {
                             usleep(throttleMs * 1000);
                             // notify of throttle start on verbose log