diff --git a/Makefile.am b/Makefile.am
index 1e25726..786ca13 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -16,5 +16,7 @@ libpreload_la_LDFLAGS = -ldl
 bin_SCRIPTS = wrapper.py makecab.py
 
 install-exec-hook:
-	cd $(DESTDIR)$(bindir) && $(LN_S) wrapper.py candle
-	cd $(DESTDIR)$(bindir) && $(LN_S) wrapper.py light
+	cd $(DESTDIR)$(bindir) && \
+		{ test -h candle || $(LN_S) wrapper.py candle; }
+	cd $(DESTDIR)$(bindir) && \
+		{ test -h light || $(LN_S) wrapper.py light; }