diff --git a/src/data/fitparser.cpp b/src/data/fitparser.cpp
index 5b473aea..973070a0 100644
--- a/src/data/fitparser.cpp
+++ b/src/data/fitparser.cpp
@@ -145,7 +145,8 @@ bool FITParser::parseDefinitionMessage(quint8 header)
 				return false;
 			_len -= sizeof(def->devFields[i]);
 		}
-	}
+	} else
+		def->numDevFields = 0;
 
 	return true;
 }