diff --git a/Makefile b/Makefile
index d80c6cba..0c9fd927 100644
--- a/Makefile
+++ b/Makefile
@@ -47,7 +47,7 @@ ifeq ($(WARNINGS), 1)
 	CXXFLAGS += -Wall -Wextra -pedantic
 endif
 
-ifeq ($(ALL_WARNINGS), 1)
+ifeq ($(WARNINGS_ALL), 1)
 	ifneq ($(findstring clang,$(CXX)),)
 		# Use clang-specific flag -Weverything
 		CXXFLAGS += -Weverything
@@ -57,7 +57,7 @@ ifeq ($(ALL_WARNINGS), 1)
 	endif
 endif
 
-ifeq ($(FATAL_WARNINGS), 1)
+ifeq ($(WARNINGS_FATAL), 1)
 	CXXFLAGS += -Werror
 endif