diff --git a/Makefile.in b/Makefile.in
index 6b820e490..d63e2d119 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -798,7 +798,7 @@ fish: $(FISH_OBJS) obj/fish.o $(PCRE2_LIB)
 	$(CXX) $(CXXFLAGS) $(LDFLAGS_FISH) $(FISH_OBJS) obj/fish.o $(LIBS) -o $@
 
 $(PCRE2_H):
-	(cd $(PCRE2_DIR) && autoconf && ./configure $(PCRE2_CONFIG) && make)
+	(cd $(PCRE2_DIR) && autoreconf -i && ./configure $(PCRE2_CONFIG) && make)
 
 $(PCRE2_LIB): $(PCRE2_H)