diff --git a/Makefile b/Makefile
index f2cea23b..07612784 100644
--- a/Makefile
+++ b/Makefile
@@ -65,7 +65,7 @@ COMPILED_LIBS = $(CHIBI_COMPILED_LIBS) $(CHIBI_IO_COMPILED_LIBS) \
 	lib/scheme/time$(SO)
 
 ifndef EXCLUDE_POSIX_LIBS
-COMPILED_LIBS += lib/srfi/18/threads$(SO) 
+COMPILED_LIBS += lib/srfi/18/threads$(SO)
 endif
 
 BASE_INCLUDES = include/chibi/sexp.h include/chibi/features.h include/chibi/install.h include/chibi/bignum.h
@@ -154,7 +154,7 @@ sexp-ulimit.o: sexp.c $(BASE_INCLUDES)
 main.o: main.c $(INCLUDES)
 	$(CC) -c $(XCPPFLAGS) $(XCFLAGS) -o $@ $<
 
-SEXP_OBJS = gc.o sexp.o bignum.o gc_heap.o 
+SEXP_OBJS = gc.o sexp.o bignum.o gc_heap.o
 SEXP_ULIMIT_OBJS = gc-ulimit.o sexp-ulimit.o bignum.o gc_heap.o
 EVAL_OBJS = opcodes.o vm.o eval.o simplify.o
 
@@ -251,7 +251,7 @@ lib/scheme/char/case-offsets.scm: data/UnicodeData.txt chibi-scheme$(EXE) all-li
 checkdefs:
 	@for d in $(D); do \
 	    if ! $(GREP) -q " SEXP_USE_$${d%%=*} " include/chibi/features.h; then \
-	        echo "WARNING: unknown definition $$d"; \
+		echo "WARNING: unknown definition $$d"; \
 	    fi; \
 	done
 
@@ -259,9 +259,9 @@ test-basic: chibi-scheme$(EXE)
 	@for f in tests/basic/*.scm; do \
 	    $(CHIBI) -xchibi $$f >$${f%.scm}.out 2>$${f%.scm}.err; \
 	    if $(DIFF) -q $(DIFFOPTS) $${f%.scm}.out $${f%.scm}.res; then \
-	        echo "[PASS] $${f%.scm}"; \
+		echo "[PASS] $${f%.scm}"; \
 	    else \
-	        echo "[FAIL] $${f%.scm}"; \
+		echo "[FAIL] $${f%.scm}"; \
 	    fi; \
 	done