diff --git a/test/CodeGen/X86/isnan.llx b/test/CodeGen/X86/isnan.llx
index eb7bed36282..df4390a4ab4 100644
--- a/test/CodeGen/X86/isnan.llx
+++ b/test/CodeGen/X86/isnan.llx
@@ -1,7 +1,7 @@
 ; RUN: llvm-as < %s | llc -march=x86 | not grep call
-declare bool %llvm.isnan(double)
+declare bool %llvm.isunordered(double)
 
 bool %test_isnan(double %X) {
-	%R = call bool %llvm.isnan(double %X)
+	%R = call bool %llvm.isunordered(double %X, double %X)
 	ret bool %R
 }