diff --git a/tools/perf/arch/powerpc/util/header.c b/tools/perf/arch/powerpc/util/header.c
index c7df534dbf8f..0be74f048f96 100644
--- a/tools/perf/arch/powerpc/util/header.c
+++ b/tools/perf/arch/powerpc/util/header.c
@@ -14,8 +14,8 @@
 
 static bool is_compat_mode(void)
 {
-	u64 base_platform = getauxval(AT_BASE_PLATFORM);
-	u64 platform = getauxval(AT_PLATFORM);
+	unsigned long base_platform = getauxval(AT_BASE_PLATFORM);
+	unsigned long platform = getauxval(AT_PLATFORM);
 
 	if (!strcmp((char *)platform, (char *)base_platform))
 		return false;