diff --git a/lib/libc/powerpc64/gen/fpsetmask.c b/lib/libc/powerpc64/gen/fpsetmask.c
index 4d63552470be..d6d32edc3e58 100644
--- a/lib/libc/powerpc64/gen/fpsetmask.c
+++ b/lib/libc/powerpc64/gen/fpsetmask.c
@@ -46,8 +46,8 @@ fpsetmask(fp_except_t mask)
 	fp_rnd_t old;
 
 	__asm__("mffs %0" : "=f"(fpscr));
-	old = (fp_rnd_t)((fpscr >> 3) & 0x1f);
-	fpscr = (fpscr & 0xffffff07) | (mask << 3);
+	old = (fp_except_t)((fpscr >> 3) & 0x1f);
+	fpscr = (fpscr & 0xffffff07) | ((mask & 0x1f) << 3);
 	__asm__ __volatile("mtfsf 0xff,%0" :: "f"(fpscr));
 	return (old);
 }