diff --git a/makefile b/makefile
index e74ad31..fde7775 100644
--- a/makefile
+++ b/makefile
@@ -130,11 +130,11 @@ else
 	ifeq ($(MEMCHK),1)
 		#use asan to check memory leaks/invalid accesses
 		LDFLAGS+=-fsanitize=address -fno-omit-frame-pointer -fno-optimize-sibling-calls
-		COMPILER_FLAGS+=-fsanitize=address -fno-omit-frame-pointer -fno-optimize-sibling-calls -DOUR_DICK_DISABLE_NOTHROW_ALLOCATE
+		COMPILER_FLAGS+=-fsanitize=address -fno-omit-frame-pointer -fno-optimize-sibling-calls -DOUR_DICK_DISABLE_NOTHROW_ALLOCATE -DENABLE_MEMCHK=1
 	endif
 	ifeq ($(UNDEFCHK),1)
 		LDFLAGS+=-fsanitize=undefined
-		COMPILER_FLAGS+=-fsanitize=undefined
+		COMPILER_FLAGS+=-fsanitize=undefined -DENABLE_UNDEFCHK=1
 	endif
 endif
 
diff --git a/src/nothrow_allocation.cpp b/src/nothrow_allocation.cpp
index 936dfd6..8522d9c 100644
--- a/src/nothrow_allocation.cpp
+++ b/src/nothrow_allocation.cpp
@@ -20,7 +20,7 @@
 #include <cstdlib> //malloc, free
 #include <new>
 
-#ifndef OUR_DICK_DISABLE_NOTHROW_ALLOCATE
+#ifndef ENABLE_MEMCHK
 void* operator new(size_t newsize){
 	return std::malloc(newsize);
 }