diff --git a/Makefile b/Makefile
index 0099840..34de4c8 100644
--- a/Makefile
+++ b/Makefile
@@ -28,7 +28,7 @@ RUSTLIBS = --extern getopt=build/o/libgetopt.rlib \
 CFLAGS += -I$(SYSEXITS)
 
 .PHONY: all
-all: dj false fop hru intcmp mm npc rpn scrut sleep str strcmp swab true
+all: dj eep false fop hru intcmp mm npc rpn scrut str strcmp swab true
 
 build:
 	# keep build/include until bindgen(1) has stdin support
@@ -118,12 +118,12 @@ scrut: build/bin/scrut
 build/bin/scrut: src/scrut.c build
 	$(CC) $(CFLAGS) -o $@ src/scrut.c
 
-.PHONY: sleep
-sleep: build/bin/sleep
-build/bin/sleep: src/sleep.rs build rustlibs
+.PHONY: eep
+eep: build/bin/eep
+build/bin/eep: src/eep.rs build rustlibs
 	$(RUSTC) $(RUSTFLAGS) \
 		--extern sysexits=build/o/libsysexits.rlib \
-		-o $@ src/sleep.rs
+		-o $@ src/eep.rs
 
 .PHONY: str
 str: build/bin/str
diff --git a/src/sleep.rs b/src/eep.rs
similarity index 100%
rename from src/sleep.rs
rename to src/eep.rs