diff --git a/Makefile b/Makefile
index d33aab23b7c188906c63f25e26852d885292237f..ca85c7adf4d896d01136e9536ae25795a1174afd 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ HAMMER_LIB = ./lib
 CFLAGS += -I$(HAMMER_INCLUDE)
 LDFLAGS += -L$(HAMMER_LIB)
 
-.PHONY: all test
+.PHONY: all test clean
 all: pdf
 
 test: pdf
@@ -19,3 +19,6 @@ test: pdf
 
 pdf: pdf.c
 	$(CC) -o $@ $(CFLAGS) $(LDFLAGS) $< -lhammer -lz
+
+clean:
+	rm -f pdf