diff --git a/ChangeLog b/ChangeLog
index 5b9ee68..536ce7c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2018-03-01  Werner Lemberg  <wl@gnu.org>
+
+	* src/truetype/ttinterp.c (TT_RunIns): Fix tracing arguments.
+
 2018-02-23  Werner Lemberg  <wl@gnu.org>
 
 	* builds/unix/configure.raw: Need HarfBuzz 1.3.0 or newer.
diff --git a/src/truetype/ttinterp.c b/src/truetype/ttinterp.c
index 5c8ff4f..240dae9 100644
--- a/src/truetype/ttinterp.c
+++ b/src/truetype/ttinterp.c
@@ -8521,8 +8521,8 @@
 
   LNo_Error_:
     FT_TRACE4(( "  %d instruction%s executed\n",
-                ins_counter == 1 ? "" : "s",
-                ins_counter ));
+                ins_counter,
+                ins_counter == 1 ? "" : "s" ));
     return FT_Err_Ok;
 
   LErrorCodeOverflow_: