diff --git a/lib/common/zstd_internal.h b/lib/common/zstd_internal.h
index bd534d715..abf35d21a 100644
--- a/lib/common/zstd_internal.h
+++ b/lib/common/zstd_internal.h
@@ -63,7 +63,7 @@ extern "C" {
  */
 #define RETURN_ERROR_IF(cond, err, ...) \
   if (cond) { \
-    RAWLOG(3, "%s:%d: check %s failed, returning %s", __FILE__, __LINE__, ZSTD_QUOTE(cond), ZSTD_QUOTE(ERROR(err))); \
+    RAWLOG(3, "%s:%d: ERROR!: check %s failed, returning %s", __FILE__, __LINE__, ZSTD_QUOTE(cond), ZSTD_QUOTE(ERROR(err))); \
     RAWLOG(3, ": " __VA_ARGS__); \
     RAWLOG(3, "\n"); \
     return ERROR(err); \
@@ -76,7 +76,7 @@ extern "C" {
  */
 #define RETURN_ERROR(err, ...) \
   do { \
-    RAWLOG(3, "%s:%d: unconditional check failed, returning %s", __FILE__, __LINE__, ZSTD_QUOTE(ERROR(err))); \
+    RAWLOG(3, "%s:%d: ERROR!: unconditional check failed, returning %s", __FILE__, __LINE__, ZSTD_QUOTE(ERROR(err))); \
     RAWLOG(3, ": " __VA_ARGS__); \
     RAWLOG(3, "\n"); \
     return ERROR(err); \
@@ -91,7 +91,7 @@ extern "C" {
   do { \
     size_t const err_code = (err); \
     if (ERR_isError(err_code)) { \
-      RAWLOG(3, "%s:%d: forwarding error in %s: %s", __FILE__, __LINE__, ZSTD_QUOTE(err), ERR_getErrorName(err_code)); \
+      RAWLOG(3, "%s:%d: ERROR!: forwarding error in %s: %s", __FILE__, __LINE__, ZSTD_QUOTE(err), ERR_getErrorName(err_code)); \
       RAWLOG(3, ": " __VA_ARGS__); \
       RAWLOG(3, "\n"); \
       return err_code; \