diff --git a/lib/Target/JSBackend/CallHandlers.h b/lib/Target/JSBackend/CallHandlers.h
index fef94436e7c..8c9eb7125fc 100644
--- a/lib/Target/JSBackend/CallHandlers.h
+++ b/lib/Target/JSBackend/CallHandlers.h
@@ -800,9 +800,11 @@ DEF_BUILTIN_HANDLER(llvm_fabs_f64, Math_abs);
 DEF_BUILTIN_HANDLER(ceil, Math_ceil);
 DEF_BUILTIN_HANDLER(ceilf, Math_ceil);
 DEF_BUILTIN_HANDLER(ceill, Math_ceil);
+DEF_BUILTIN_HANDLER(llvm_ceil_f64, Math_ceil);
 DEF_BUILTIN_HANDLER(floor, Math_floor);
 DEF_BUILTIN_HANDLER(floorf, Math_floor);
 DEF_BUILTIN_HANDLER(floorl, Math_floor);
+DEF_BUILTIN_HANDLER(llvm_floor_f64, Math_floor);
 DEF_MAYBE_BUILTIN_HANDLER(pow, Math_pow);
 DEF_MAYBE_BUILTIN_HANDLER(powf, Math_pow);
 DEF_MAYBE_BUILTIN_HANDLER(powl, Math_pow);
@@ -2039,9 +2041,11 @@ void setupCallHandlers() {
   SETUP_CALL_HANDLER(ceil);
   SETUP_CALL_HANDLER(ceilf);
   SETUP_CALL_HANDLER(ceill);
+  SETUP_CALL_HANDLER(llvm_ceil_f64);
   SETUP_CALL_HANDLER(floor);
   SETUP_CALL_HANDLER(floorf);
   SETUP_CALL_HANDLER(floorl);
+  SETUP_CALL_HANDLER(llvm_floor_f64);
   SETUP_CALL_HANDLER(pow);
   SETUP_CALL_HANDLER(powf);
   SETUP_CALL_HANDLER(powl);