diff --git a/lib/techniques/error/use.py b/lib/techniques/error/use.py
index c65cbd82e..fada39c40 100644
--- a/lib/techniques/error/use.py
+++ b/lib/techniques/error/use.py
@@ -115,7 +115,7 @@ def __oneShotErrorUse(expression, field=None):
 
                     if trimmed:
                         warnMsg = "possible server trimmed output detected (due to its length): "
-                        warnMsg += trimmed
+                        warnMsg += safecharencode(trimmed)
                         logger.warn(warnMsg)
 
                 if any(Backend.isDbms(dbms) for dbms in (DBMS.MYSQL, DBMS.MSSQL)):
diff --git a/lib/techniques/union/use.py b/lib/techniques/union/use.py
index 78670ccda..435fdab77 100644
--- a/lib/techniques/union/use.py
+++ b/lib/techniques/union/use.py
@@ -100,7 +100,7 @@ def __oneShotUnionUse(expression, unpack=True, limited=False):
 
             if trimmed:
                 warnMsg = "possible server trimmed output detected (probably due to its length): "
-                warnMsg += trimmed
+                warnMsg += safecharencode(trimmed)
                 logger.warn(warnMsg)
 
     return retVal