diff --git a/drm/common/IDrmManagerService.cpp b/drm/common/IDrmManagerService.cpp
index caae75fc2a..44f98dd3ce 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 d696f163b4..16b5b34131 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;
diff --git a/drm/drmserver/DrmManager.cpp b/drm/drmserver/DrmManager.cpp
index e168ba24e6..c27561b151 100644
--- a/drm/drmserver/DrmManager.cpp
+++ b/drm/drmserver/DrmManager.cpp
@@ -33,7 +33,7 @@
 #include "DrmManager.h"
 #include "ReadWriteUtils.h"
 
-#define DECRYPT_FILE_ERROR -1
+#define DECRYPT_FILE_ERROR (-1)
 
 using namespace android;
 
diff --git a/drm/libdrmframework/DrmManagerClientImpl.cpp b/drm/libdrmframework/DrmManagerClientImpl.cpp
index cbd013e8bd..c047eb13b1 100644
--- a/drm/libdrmframework/DrmManagerClientImpl.cpp
+++ b/drm/libdrmframework/DrmManagerClientImpl.cpp
@@ -28,7 +28,7 @@
 
 using namespace android;
 
-#define INVALID_VALUE -1
+#define INVALID_VALUE (-1)
 
 Mutex DrmManagerClientImpl::sMutex;
 sp<IDrmManagerService> DrmManagerClientImpl::sDrmManagerService;