diff --git a/src/Makefile.am b/src/Makefile.am
index a176d86..c08b94c 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -268,10 +268,10 @@ $(EXTHEADERS) $(EXTSOURCES): c_client.py
 SUFFIXES = .xml
 
 .xml.h:
-	$(PYTHON) c_client.py -p $(XCBPROTO_XCBPYTHONDIR) $(XCBPROTO_XCBINCLUDEDIR)/$<
+	$(PYTHON) $(srcdir)/c_client.py -p $(XCBPROTO_XCBPYTHONDIR) $(XCBPROTO_XCBINCLUDEDIR)/$<
 
 .xml.c:
-	$(PYTHON) c_client.py -p $(XCBPROTO_XCBPYTHONDIR) $(XCBPROTO_XCBINCLUDEDIR)/$<
+	$(PYTHON) $(srcdir)/c_client.py -p $(XCBPROTO_XCBPYTHONDIR) $(XCBPROTO_XCBINCLUDEDIR)/$<
 
 $(EXTENSION_XML):
 	$(LN_S) -f $(XCBPROTO_XCBINCLUDEDIR)/$@ $@