diff --git a/lib/mpi/longlong.h b/lib/mpi/longlong.h
index 891e1c3549c4..afbd99987cf8 100644
--- a/lib/mpi/longlong.h
+++ b/lib/mpi/longlong.h
@@ -653,7 +653,7 @@ do {						\
 	**************  MIPS/64  **************
 	***************************************/
 #if (defined(__mips) && __mips >= 3) && W_TYPE_SIZE == 64
-#if defined(__mips_isa_rev) && __mips_isa_rev >= 6
+#if defined(__mips_isa_rev) && __mips_isa_rev >= 6 && defined(CONFIG_CC_IS_GCC)
 /*
  * GCC ends up emitting a __multi3 intrinsic call for MIPS64r6 with the plain C
  * code below, so we special case MIPS64r6 until the compiler can do better.