diff --git a/Makefile b/Makefile
index e1a8461..c5076ef 100644
--- a/Makefile
+++ b/Makefile
@@ -14,10 +14,10 @@ LIB_OBJECTS := $(patsubst %.c, %.o, $(LIB_SOURCES))
 TEST_OBJECTS := $(patsubst %.c, %.o, $(TEST_SOURCES))
 
 ifeq ($(DEBUG), yes)
-    CFLAGS := -Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow -Wconversion -fPIC -g3 -D__DEBUG_
+    CFLAGS := -Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow -Wconversion -fPIC -g3 -D__DEBUG__
     LFLAGS :=
 else ifeq ($(DEBUG), asan)
-    CFLAGS := -Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow -Wconversion -fsanitize=address -fPIC -g3 -D__DEBUG_
+    CFLAGS := -Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow -Wconversion -fsanitize=address -fPIC -g3 -D__DEBUG__
     LFLAGS := -fsanitize=address -static-libasan
 else
     CFLAGS := -fPIC