diff --git a/meta/recipes-kernel/perf/perf.bb b/meta/recipes-kernel/perf/perf.bb
index 269069f3af..d27e535605 100644
--- a/meta/recipes-kernel/perf/perf.bb
+++ b/meta/recipes-kernel/perf/perf.bb
@@ -89,6 +89,12 @@ EXTRA_OEMAKE += "\
 	'infodir=${@oe.path.relative(prefix, infodir)}' \
 "
 
+# PPC64 uses long long for u64 in the kernel, but powerpc's asm/types.h
+# prevents 64-bit userland from seeing this definition, instead defaulting
+# to u64 == long in userspace. Define __SANE_USERSPACE_TYPES__ to get 
+# int-ll64.h included.
+EXTRA_OEMAKE_append_powerpc64 = ' CFLAGS=-D__SANE_USERSPACE_TYPES__'
+
 PARALLEL_MAKE = ""
 
 do_compile() {