diff --git a/plugins/gps_importer/Makefile.am b/plugins/gps_importer/Makefile.am
index cd865d89d7d..6e5ab940dd9 100644
--- a/plugins/gps_importer/Makefile.am
+++ b/plugins/gps_importer/Makefile.am
@@ -12,8 +12,6 @@
 
 if HAVE_EXPAT
 
-PKGDATAPATH=-DPKGDATAPATH=\"$(pkgdatadir)\"
-
 plugindir = ${pkglibdir}
 
 plugin_LTLIBRARIES = gpsimporterplugin.la
diff --git a/plugins/spit/Makefile.am b/plugins/spit/Makefile.am
index 81c7f0e1f1e..f0233188a1a 100644
--- a/plugins/spit/Makefile.am
+++ b/plugins/spit/Makefile.am
@@ -10,7 +10,6 @@
 #
 # $Id$
 
-PREFIX=-DPREFIX=\"$(prefix)\"
 plugindir = ${pkglibdir}
 
 plugin_LTLIBRARIES = spitplugin.la