diff --git a/src/liballoc/heap.rs b/src/liballoc/heap.rs
index 02933c763efe..b7bc1b476461 100644
--- a/src/liballoc/heap.rs
+++ b/src/liballoc/heap.rs
@@ -119,7 +119,8 @@ unsafe fn exchange_free(ptr: *mut u8, old_size: uint, align: uint) {
           not(feature = "external_crate"),
           any(target_arch = "arm",
               target_arch = "mips",
-              target_arch = "mipsel")))]
+              target_arch = "mipsel",
+              target_arch = "powerpc")))]
 const MIN_ALIGN: uint = 8;
 #[cfg(all(not(feature = "external_funcs"),
           not(feature = "external_crate"),