diff --git a/src/glog/logging.h.in b/src/glog/logging.h.in
index f34dbe4..57d077f 100644
--- a/src/glog/logging.h.in
+++ b/src/glog/logging.h.in
@@ -1037,7 +1037,9 @@ const LogSeverity GLOG_0 = GLOG_ERROR;
   while (false) \
     GLOG_MSVC_POP_WARNING() CHECK_GT(val1, val2)
 
-#define DCHECK_NOTNULL(val) (void)(val)
+// You may see warnings in release mode if you don't use the return
+// value of DCHECK_NOTNULL. Please just use DCHECK for such cases.
+#define DCHECK_NOTNULL(val) (val)
 
 #define DCHECK_STREQ(str1, str2) \
   GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
diff --git a/src/windows/glog/logging.h b/src/windows/glog/logging.h
index 05aba8c..162669e 100755
--- a/src/windows/glog/logging.h
+++ b/src/windows/glog/logging.h
@@ -1041,7 +1041,9 @@ const LogSeverity GLOG_0 = GLOG_ERROR;
   while (false) \
     GLOG_MSVC_POP_WARNING() CHECK_GT(val1, val2)
 
-#define DCHECK_NOTNULL(val) (void)(val)
+// You may see warnings in release mode if you don't use the return
+// value of DCHECK_NOTNULL. Please just use DCHECK for such cases.
+#define DCHECK_NOTNULL(val) (val)
 
 #define DCHECK_STREQ(str1, str2) \
   GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \