diff --git a/Makefile b/Makefile
index caef201..c91feba 100644
--- a/Makefile
+++ b/Makefile
@@ -36,8 +36,8 @@ EXECS = \
 CABAL_FLAGS ?= -O -v0
 
 SYNTAXDIR := syntax
-SYNTAXFLAGS = \
-  $(patsubst %,--syntax-definition=%,$(shell find $(SYNTAXDIR) -name '*.xml'))
+SYNTAXFILES != find $(SYNTAXDIR) -name *.xml
+SYNTAXFLAGS = $(patsubst %,--syntax-definition=%,$(SYNTAXFILES))
 
 .PHONY: all
 all: build
@@ -46,7 +46,7 @@ all: build
 build: $(EXECS) $(OUTPUT)
 
 
-POSTDEPS = $(TEMPLATEDIR)/* $(LANGFILTER) $(LAANTAS_SCRIPT)
+POSTDEPS = $(TEMPLATEDIR)/* $(LANGFILTER) $(LAANTAS_SCRIPT) $(SYNTAXFILES)
 
 $(TMPDIR)/all-tags.md $(TMPDIR)/tags.mk &: $(POSTS) $(ALL_TAGS)
 	@echo "[all-tags]"