diff --git a/lib/Target/CBackend/CBackend.cpp b/lib/Target/CBackend/CBackend.cpp
index ed3ff81..5814d27 100644
--- a/lib/Target/CBackend/CBackend.cpp
+++ b/lib/Target/CBackend/CBackend.cpp
@@ -2600,7 +2600,7 @@
 
   // If this is a negation operation, print it out as such.  For FP, we don't
   // want to print "-0.0 - X".
-  if (BinaryOperator::isNeg(&I) || BinaryOperator::isFNeg(&I)) {
+  if (BinaryOperator::isNeg(&I)) {
     Out << "-(";
     writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
     Out << ")";
diff --git a/test/CodeGen/CBackend/fneg.ll b/test/CodeGen/CBackend/fneg.ll
new file mode 100644
index 0000000..68849b2
--- /dev/null
+++ b/test/CodeGen/CBackend/fneg.ll
@@ -0,0 +1,7 @@
+; RUN: llvm-as < %s | llc -march=c
+
+define void @func() nounwind {
+  entry:
+  %0 = fsub double -0.0, undef
+  ret void
+}