diff --git a/Lib/LLVMJIT/EmitModule.cpp b/Lib/LLVMJIT/EmitModule.cpp
index cf930e01d..2bc215229 100644
--- a/Lib/LLVMJIT/EmitModule.cpp
+++ b/Lib/LLVMJIT/EmitModule.cpp
@@ -255,7 +255,7 @@ void LLVMJIT::emitModule(const IR::Module& irModule,
 			asLLVMType(llvmContext, functionType),
 			llvm::Function::ExternalLinkage,
 			functionIndex >= irModule.functions.imports.size()
-				? names.functions[functionIndex].name /* getExternalName("functionDef", functionIndex - irModule.functions.imports.size()) */
+				? std::string("wasm::") + names.functions[functionIndex].name /* getExternalName("functionDef", functionIndex - irModule.functions.imports.size()) */
 				: getExternalName("functionImport", functionIndex),
 			&outLLVMModule);
 		function->setCallingConv(asLLVMCallingConv(functionType.callingConvention()));
diff --git a/Lib/LLVMJIT/LLVMJIT.cpp b/Lib/LLVMJIT/LLVMJIT.cpp
index 789bfaee0..2c96481c0 100644
--- a/Lib/LLVMJIT/LLVMJIT.cpp
+++ b/Lib/LLVMJIT/LLVMJIT.cpp
@@ -53,6 +53,7 @@ namespace LLVMRuntimeSymbols {
 	static HashMap<std::string, void*> map = {
 		{"memmove", (void*)&memmove},
 		{"memset", (void*)&memset},
+		{"memcpy", (void*)&memcpy},
 #ifdef _WIN32
 		{"__chkstk", (void*)&__chkstk},
 		{"__CxxFrameHandler3", (void*)&__CxxFrameHandler3},