diff --git a/tools/perf/util/expr.y b/tools/perf/util/expr.y
index 954556bea36ef758ef31c5f7a1e723cc8fe50db0..953e65ba2cc7135c7e3fd35e929d607f6c74d9e5 100644
--- a/tools/perf/util/expr.y
+++ b/tools/perf/util/expr.y
@@ -62,7 +62,7 @@ all_expr: expr			{ *final_val = $1; }
 
 expr:	  NUMBER
 	| ID			{ if (lookup_id(ctx, $1, &$$) < 0) {
-					pr_debug("%s not found", $1);
+					pr_debug("%s not found\n", $1);
 					YYABORT;
 				  }
 				}