diff --git a/Makefile b/Makefile
index 1e9be818..bca523a9 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@ PROJECT = tildefriends
 BUILD_DIR ?= out
 BUILD_DIR_DBG := $(BUILD_DIR)/debug
 BUILD_DIR_REL := $(BUILD_DIR)/release
-UNAME_M := $(shell uname -s)
+UNAME_M := $(shell uname -m)
 
 CFLAGS += \
 	-Wall \
@@ -17,9 +17,9 @@ LDFLAGS += -Wl,-gc-sections
 debug: CFLAGS += -Og -g
 release: CFLAGS += -DNDEBUG -O3
 
-ifeq ($(UNAME_M),x64_64)
-	debug: CFLAGS += -fsanitize=address -fsanitize=undefined
-	debug: LDFLAGS += -fsanitize=address -fsanitize=undefined
+ifeq ($(UNAME_M),x86_64)
+debug: CFLAGS += -fsanitize=address -fsanitize=undefined
+debug: LDFLAGS += -fsanitize=address -fsanitize=undefined
 endif
 
 APP_SOURCES = $(wildcard src/*.c)