diff --git a/lib/Target/PowerPC/PPC.h b/lib/Target/PowerPC/PPC.h
index 785f9e09b2c..7ca87d9ba52 100644
--- a/lib/Target/PowerPC/PPC.h
+++ b/lib/Target/PowerPC/PPC.h
@@ -30,6 +30,9 @@ FunctionPass *createAIXAsmPrinter(std::ostream &OS, TargetMachine &TM);
 
 } // end namespace llvm;
 
+// GCC #defines PPC on Linux but we use it as our namespace name
+#undef PPC
+
 // Defines symbolic names for PowerPC registers.  This defines a mapping from
 // register name to register number.
 //