diff --git a/makefile b/makefile
index 1b95bb9..1ca0b68 100644
--- a/makefile
+++ b/makefile
@@ -6,13 +6,14 @@
 NAME := powerbar-module.so
 
 PREFIX = /usr/local
+LIBDIR = $(PREFIX)/lib
 INSTALL = install
 
 LIBS := gtk+-3.0 gmodule-export-2.0
 CFLAGS += -std=c11 -fPIC $(shell pkg-config --cflags $(LIBS))
 LDLIBS += $(shell pkg-config --libs $(LIBS))
 
-SRC = $(wildcard *.c) 
+SRC = $(wildcard *.c)
 OBJ = $(SRC:%.c=%.o)
 
 TRASH = $(OBJ) $(NAME)
@@ -25,11 +26,11 @@ clean:
 	@rm $(TRASH) | true
 
 install:
-	$(INSTALL) -d $(DESTDIR)$(PREFIX)/lib/gtklock
-	$(INSTALL) $(NAME) $(DESTDIR)$(PREFIX)/lib/gtklock/$(NAME)
+	$(INSTALL) -d $(DESTDIR)$(LIBDIR)/gtklock
+	$(INSTALL) $(NAME) $(DESTDIR)$(LIBDIR)/gtklock/$(NAME)
 
 uninstall:
-	rm -f $(DESTDIR)$(PREFIX)/lib/$(NAME)
+	rm -f $(DESTDIR)$(LIBDIR)/gtklock/$(NAME)
 
 $(NAME): $(OBJ)
 	$(LINK.c) -shared $^ $(LDLIBS) -o $@