diff --git a/makefile b/makefile
index b0ff4d0..3ec5dfb 100644
--- a/makefile
+++ b/makefile
@@ -6,13 +6,11 @@ CCOMPILE = \
 	mkdir -p $(@D); \
 	$(CC) $(CFLAGS) $^ -o $@
 
-ex-1: ex-1/bin/main ex-1/bin/pdf ex-1/bin/histo
+ex-1: ex-1/bin/main ex-1/bin/pdf
 ex-1/bin/main: ex-1/main.c ex-1/landau.c ex-1/tests.c ex-1/bootstrap.c
 	$(CCOMPILE)
 ex-1/bin/pdf: ex-1/pdf.c
 	$(CCOMPILE)
-ex-1/bin/histo: ex-1/histo.c
-	$(CCOMPILE)
 
 ex-2: ex-2/bin/fancy ex-2/bin/fancier ex-2/bin/fast ex-2/bin/limit ex-2/bin/naive ex-2/bin/recip
 ex-2/bin/%: ex-2/%.c