diff --git a/tools/git2graph/Makefile b/tools/git2graph/Makefile
index df46022..2e19cff 100644
--- a/tools/git2graph/Makefile
+++ b/tools/git2graph/Makefile
@@ -1,15 +1,17 @@
 CC = gcc
 LD = gcc
-CFLAGS = -Wall -Werror $(shell pkg-config --cflags libgit2)
-LDFLAGS = $(shell pkg-config --libs libgit2)
+LIBS = libgit2
+
+CFLAGS = -Wall -Werror $(shell pkg-config --cflags $(LIBS))
+LDFLAGS = $(shell pkg-config --libs $(LIBS))
 
 all: git2graph
 
 git2graph: git2graph.o
 	$(LD) -o $@ $^ $(CFLAGS) $(LDFLAGS)
 
 %.o: %.c
 	$(CC) $(CFLAGS) -c $<
 
 clean:
 	rm -f *.o git2graph