diff --git a/drm/common/IDrmManagerService.cpp b/drm/common/IDrmManagerService.cpp
index f2e14b6..1614e26 100644
--- a/drm/common/IDrmManagerService.cpp
+++ b/drm/common/IDrmManagerService.cpp
@@ -33,7 +33,7 @@
 
 #include "IDrmManagerService.h"
 
-#define INVALID_BUFFER_LENGTH -1
+#define INVALID_BUFFER_LENGTH (-1)
 #define MAX_BINDER_TRANSACTION_SIZE ((1*1024*1024)-(4096*2))
 
 using namespace android;
diff --git a/drm/common/ReadWriteUtils.cpp b/drm/common/ReadWriteUtils.cpp
index d696f16..16b5b34 100644
--- a/drm/common/ReadWriteUtils.cpp
+++ b/drm/common/ReadWriteUtils.cpp
@@ -30,7 +30,7 @@
 
 using namespace android;
 
-#define FAILURE -1
+#define FAILURE (-1)
 
 String8 ReadWriteUtils::readBytes(const String8& filePath) {
     FILE* file = NULL;