diff --git a/libs/ui/InputReader.cpp b/libs/ui/InputReader.cpp
index dc9085b..aa690e5 100644
--- a/libs/ui/InputReader.cpp
+++ b/libs/ui/InputReader.cpp
@@ -2007,7 +2007,7 @@
     }
 
     if (mCalibration.haveToolSizeIsSummed) {
-        dump.appendFormat(INDENT4 "touch.toolSize.isSummed: %d\n",
+        dump.appendFormat(INDENT4 "touch.toolSize.isSummed: %s\n",
                 toString(mCalibration.toolSizeIsSummed));
     }