diff --git a/lib/System/Memory.cpp b/lib/System/Memory.cpp
index bbb7917dca3..3660bcb1a4a 100644
--- a/lib/System/Memory.cpp
+++ b/lib/System/Memory.cpp
@@ -27,6 +27,8 @@ using namespace sys;
 #include "Win32/Memory.inc"
 #endif
 
+extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
+
 /// InvalidateInstructionCache - Before the JIT can run a block of code
 /// that has been emitted it must invalidate the instruction cache on some
 /// platforms.
@@ -37,14 +39,13 @@ void llvm::sys::Memory::InvalidateInstructionCache(const void *Addr,
 #if (defined(__POWERPC__) || defined (__ppc__) || \
      defined(_POWER) || defined(_ARCH_PPC))
    #if defined(__APPLE__)
-       extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
-       sys_icache_invalidate(Addr, len);
+       sys_icache_invalidate(Addr, Len);
    #elif defined(__GNUC__)
         const size_t LineSize = 32;
 
         const intptr_t Mask = ~(LineSize - 1);
         const intptr_t StartLine = ((intptr_t) Addr) & Mask;
-        const intptr_t EndLine = ((intptr_t) Addr + len + LineSize - 1) & Mask;
+        const intptr_t EndLine = ((intptr_t) Addr + Len + LineSize - 1) & Mask;
 
         for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
           asm volatile("dcbf 0, %0" : : "r"(Line));
@@ -56,4 +57,4 @@ void llvm::sys::Memory::InvalidateInstructionCache(const void *Addr,
    #endif
 #endif  // end PPC
 
-}
\ No newline at end of file
+}