diff --git a/Makefile b/Makefile
index 9d9d612..8114ecf 100644
--- a/Makefile
+++ b/Makefile
@@ -85,9 +85,11 @@ SPACE = $(NULL) $(NULL)
 test: tippecanoe tippecanoe-decode $(addsuffix .check,$(TESTS)) raw-tiles-test parallel-test pbf-test join-test enumerate-test decode-test join-filter-test unit json-tool-test allow-existing-test csv-test
 	./unit
 
+suffixes = json json.gz
+
 # Work around Makefile and filename punctuation limits: _ for space, @ for :, % for /
 %.json.check:
-	./tippecanoe -a@ -f -o $@.mbtiles $(subst @,:,$(subst %,/,$(subst _, ,$(patsubst %.json.check,%,$(word 4,$(subst /, ,$@)))))) $(wildcard $(subst $(SPACE),/,$(wordlist 1,2,$(subst /, ,$@)))/*.json) $(wildcard $(subst $(SPACE),/,$(wordlist 1,2,$(subst /, ,$@)))/*.json.gz) < /dev/null
+	./tippecanoe -a@ -f -o $@.mbtiles $(subst @,:,$(subst %,/,$(subst _, ,$(patsubst %.json.check,%,$(word 4,$(subst /, ,$@)))))) $(foreach suffix,$(suffixes),$(wildcard $(subst $(SPACE),/,$(wordlist 1,2,$(subst /, ,$@)))/*.$(suffix))) < /dev/null
 	./tippecanoe-decode $@.mbtiles > $@.out
 	cmp $@.out $(patsubst %.check,%,$@)
 	rm $@.out $@.mbtiles
@@ -102,7 +104,7 @@ fewer-tests: tippecanoe tippecanoe-decode geobuf-test raw-tiles-test parallel-te
 %.json.checkbuf:
 	for i in $(wildcard $(subst $(SPACE),/,$(wordlist 1,2,$(subst /, ,$@)))/*.json); do ./tippecanoe-json-tool -w $$i | ./node_modules/geobuf/bin/json2geobuf > $$i.geobuf; done
 	for i in $(wildcard $(subst $(SPACE),/,$(wordlist 1,2,$(subst /, ,$@)))/*.json.gz); do gzip -dc $$i | ./tippecanoe-json-tool -w | ./node_modules/geobuf/bin/json2geobuf > $$i.geobuf; done
-	./tippecanoe -a@ -f -o $@.mbtiles $(subst @,:,$(subst %,/,$(subst _, ,$(patsubst %.json.checkbuf,%,$(word 4,$(subst /, ,$@)))))) $(addsuffix .geobuf,$(wildcard $(subst $(SPACE),/,$(wordlist 1,2,$(subst /, ,$@)))/*.json)) $(addsuffix .geobuf,$(wildcard $(subst $(SPACE),/,$(wordlist 1,2,$(subst /, ,$@)))/*.json.gz)) < /dev/null
+	./tippecanoe -a@ -f -o $@.mbtiles $(subst @,:,$(subst %,/,$(subst _, ,$(patsubst %.json.checkbuf,%,$(word 4,$(subst /, ,$@)))))) $(foreach suffix,$(suffixes),$(addsuffix .geobuf,$(wildcard $(subst $(SPACE),/,$(wordlist 1,2,$(subst /, ,$@)))/*.$(suffix)))) < /dev/null
 	./tippecanoe-decode $@.mbtiles | sed 's/checkbuf/check/g' > $@.out
 	cmp $@.out $(patsubst %.checkbuf,%,$@)
 	rm $@.out $@.mbtiles
@@ -281,7 +283,7 @@ csv-test:
 prep-test: $(TESTS)
 
 tests/%.json: Makefile tippecanoe tippecanoe-decode
-	./tippecanoe -f -o $@.check.mbtiles $(subst @,:,$(subst %,/,$(subst _, ,$(patsubst %.json,%,$(word 4,$(subst /, ,$@)))))) $(wildcard $(subst $(SPACE),/,$(wordlist 1,2,$(subst /, ,$@)))/*.json) $(wildcard $(subst $(SPACE),/,$(wordlist 1,2,$(subst /, ,$@)))/*.json.gz)
+	./tippecanoe -f -o $@.check.mbtiles $(subst @,:,$(subst %,/,$(subst _, ,$(patsubst %.json,%,$(word 4,$(subst /, ,$@)))))) $(foreach suffix,$(suffixes),$(wildcard $(subst $(SPACE),/,$(wordlist 1,2,$(subst /, ,$@)))/*.$(suffix)))
 	./tippecanoe-decode $@.check.mbtiles > $@
 	cmp $(patsubst %.check,%,$@) $@
 	rm $@.check.mbtiles