diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 5e947e5f45..86118ebf6b 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -4156,7 +4156,7 @@ void LCodeGen::DoMathLog(LMathLog* instr) {
   __ xorps(xmm_scratch, xmm_scratch);
   __ ucomisd(input_reg, xmm_scratch);
   __ j(above, &positive, Label::kNear);
-  __ j(equal, &zero, Label::kNear);
+  __ j(not_carry, &zero, Label::kNear);
   ExternalReference nan =
       ExternalReference::address_of_canonical_non_hole_nan();
   __ movsd(input_reg, Operand::StaticVariable(nan));
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 8a1b679a5c..c392b455d5 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -3726,7 +3726,7 @@ void LCodeGen::DoMathLog(LMathLog* instr) {
   __ xorps(xmm_scratch, xmm_scratch);
   __ ucomisd(input_reg, xmm_scratch);
   __ j(above, &positive, Label::kNear);
-  __ j(equal, &zero, Label::kNear);
+  __ j(not_carry, &zero, Label::kNear);
   ExternalReference nan =
       ExternalReference::address_of_canonical_non_hole_nan();
   Operand nan_operand = masm()->ExternalOperand(nan);