diff --git a/src/powerpc/ffi_powerpc.h b/src/powerpc/ffi_powerpc.h
index 5ee2a7095..8e2f2f0e7 100644
--- a/src/powerpc/ffi_powerpc.h
+++ b/src/powerpc/ffi_powerpc.h
@@ -62,7 +62,7 @@ typedef _Float128 float128;
 #elif defined(__FLOAT128__)
 typedef __float128 float128;
 #else
-typedef __int128 float128;
+typedef char float128[16] __attribute__((aligned(16)));
 #endif
 
 void FFI_HIDDEN ffi_closure_SYSV (void);