diff --git a/third-party/miniupnp/Makefile.am b/third-party/miniupnp/Makefile.am
index 1a88d09d3..fd80a1a01 100644
--- a/third-party/miniupnp/Makefile.am
+++ b/third-party/miniupnp/Makefile.am
@@ -33,4 +33,4 @@ BUILT_SOURCES = \
     miniupnpcstrings.h
 
 miniupnpcstrings.h: Makefile
-	./updateminiupnpcstrings.sh
+	$(srcdir)/updateminiupnpcstrings.sh