diff --git a/makefile.basic b/makefile.basic
index 25ac91e..b9793b9 100644
--- a/makefile.basic
+++ b/makefile.basic
@@ -126,11 +126,11 @@ ifneq ($(RELEASE),1)
 	ifeq ($(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
+		COMPILER_FLAGS+=-fsanitize=address -fno-omit-frame-pointer -fno-optimize-sibling-calls -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/makefile.exe_progress b/makefile.exe_progress
index d64c483..c6b34be 100644
--- a/makefile.exe_progress
+++ b/makefile.exe_progress
@@ -123,11 +123,11 @@ ifneq ($(RELEASE),1)
 	ifeq ($(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
+		COMPILER_FLAGS+=-fsanitize=address -fno-omit-frame-pointer -fno-optimize-sibling-calls -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/makefile.library b/makefile.library
index 5ec75a8..0e14025 100644
--- a/makefile.library
+++ b/makefile.library
@@ -139,11 +139,11 @@ ifneq ($(RELEASE),1)
 	ifeq ($(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
+		COMPILER_FLAGS+=-fsanitize=address -fno-omit-frame-pointer -fno-optimize-sibling-calls -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/makefile.reclib b/makefile.reclib
index a86eb7b..fe4b4c2 100644
--- a/makefile.reclib
+++ b/makefile.reclib
@@ -128,13 +128,14 @@ else ifeq ($(LANG),c)
 endif
 
 ifneq ($(RELEASE),1)
+	ifeq ($(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
+		COMPILER_FLAGS+=-fsanitize=address -fno-omit-frame-pointer -fno-optimize-sibling-calls -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/makefile.recursive b/makefile.recursive
index 2dc76eb..bccc288 100644
--- a/makefile.recursive
+++ b/makefile.recursive
@@ -123,11 +123,11 @@ ifneq ($(RELEASE),1)
 	ifeq ($(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
+		COMPILER_FLAGS+=-fsanitize=address -fno-omit-frame-pointer -fno-optimize-sibling-calls -DENABLE_MEMCHK=1
 	endif
 	ifeq ($(UNDEFCHK),1)
 		LDFLAGS+=-fsanitize=undefined
-		COMPILER_FLAGS+=-fsanitize=undefined
+		COMPILER_FLAGS+=-fsanitize=undefined -DENABLE_UNDEFCHK=1
 	endif
 endif