diff --git a/module.cpp b/module.cpp
index 7fd806a4..e15d73ae 100644
--- a/module.cpp
+++ b/module.cpp
@@ -1185,9 +1185,9 @@ Module::execPreprocessor(const char* infilename, llvm::raw_string_ostream* ostre
 
     if (g->includeStdlib) {
         if (g->opt.disableAsserts) 
-            opts.addMacroDef("Assert(x)=");
+            opts.addMacroDef("assert(x)=");
         else
-            opts.addMacroDef("Assert(x)=__Assert(#x, x)");
+            opts.addMacroDef("assert(x)=__assert(#x, x)");
     }
 
     for (unsigned int i = 0; i < g->cppArgs.size(); ++i) {