diff --git a/src/ThreadedGSM.cpp b/src/ThreadedGSM.cpp
index 547a1a0..5a9e9b2 100644
--- a/src/ThreadedGSM.cpp
+++ b/src/ThreadedGSM.cpp
@@ -565,7 +565,7 @@ void ThreadedGSM::CheckRing()
                 }
             }
             if (dump) {
-                TRACE(TRACE_DEBUG, F("Gsm: %s"), buffer.c_str());
+                TRACE(TRACE_DEBUG, "Gsm: %s", buffer.c_str());
             }
             mDte.clearBuffer();
         }