diff --git a/dmd2/mangle.c b/dmd2/mangle.c
index e27dc43c..629a9315 100644
--- a/dmd2/mangle.c
+++ b/dmd2/mangle.c
@@ -24,7 +24,7 @@
 #include "id.h"
 #include "module.h"
 
-#if TARGET_LINUX || TARGET_OSX || TARGET_FREEBSD || TARGET_OPENBSD || TARGET_SOLARIS
+#if TARGET_LINUX || TARGET_OSX || TARGET_FREEBSD || TARGET_OPENBSD || TARGET_SOLARIS || IN_LLVM
 char *cpp_mangle(Dsymbol *s);
 #endif
 
diff --git a/dmd2/mars.h b/dmd2/mars.h
index 42a5134a..e4c5b80b 100644
--- a/dmd2/mars.h
+++ b/dmd2/mars.h
@@ -110,7 +110,7 @@ void unittests();
                         // 2: Modifying iteratee in body is error without -d switch
 
 // Set if C++ mangling is done by the front end
-#define CPP_MANGLE (DMDV2 && (TARGET_LINUX || TARGET_OSX || TARGET_FREEBSD || TARGET_OPENBSD || TARGET_SOLARIS))
+#define CPP_MANGLE (DMDV2 && (TARGET_LINUX || TARGET_OSX || TARGET_FREEBSD || TARGET_OPENBSD || TARGET_SOLARIS || IN_LLVM))
 
 /* Other targets are TARGET_LINUX, TARGET_OSX, TARGET_FREEBSD, TARGET_OPENBSD and
  * TARGET_SOLARIS, which are