diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 7683c6749d66..40999e1fab8f 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -1417,18 +1417,6 @@ int perf_pmu__new_format(struct list_head *list, char *name,
 	return 0;
 }
 
-void perf_pmu__set_format(unsigned long *bits, long from, long to)
-{
-	long b;
-
-	if (!to)
-		to = from;
-
-	memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
-	for (b = from; b <= to; b++)
-		__set_bit(b, bits);
-}
-
 void perf_pmu__del_formats(struct list_head *formats)
 {
 	struct perf_pmu_format *fmt, *tmp;
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 7ff925224165..9c9ea40b9c71 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -231,7 +231,6 @@ void perf_pmu_error(struct list_head *list, char *name, void *scanner, char cons
 
 int perf_pmu__new_format(struct list_head *list, char *name,
 			 int config, unsigned long *bits);
-void perf_pmu__set_format(unsigned long *bits, long from, long to);
 int perf_pmu__format_parse(int dirfd, struct list_head *head);
 void perf_pmu__del_formats(struct list_head *formats);
 bool perf_pmu__has_format(const struct perf_pmu *pmu, const char *name);
diff --git a/tools/perf/util/pmu.y b/tools/perf/util/pmu.y
index 3d46cca3bb94..9bd9e30791ff 100644
--- a/tools/perf/util/pmu.y
+++ b/tools/perf/util/pmu.y
@@ -21,6 +21,18 @@ do { \
                 YYABORT; \
 } while (0)
 
+static void perf_pmu__set_format(unsigned long *bits, long from, long to)
+{
+	long b;
+
+	if (!to)
+		to = from;
+
+	memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
+	for (b = from; b <= to; b++)
+		__set_bit(b, bits);
+}
+
 %}
 
 %token PP_CONFIG