diff --git a/configure.ac b/configure.ac
index 1bb94df6..e0a33ec8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -348,7 +348,7 @@ AC_CHECK_LIB([expect], [exp_expectl], [AM_CONDITIONAL([HAVE_EXPECT], [true])],
     [AC_MSG_NOTICE([libexpect not found, will not be able to run functional tests])])
 
 ## Default parameters
-AM_CFLAGS="-Wall -Wno-deprecated-declarations -std=gnu99"
+AM_CFLAGS="$AM_CFLAGS -Wall -Wno-deprecated-declarations -std=gnu99"
 AM_LDFLAGS="$AM_LDFLAGS -export-dynamic"
 
 AS_IF([test "x$PACKAGE_STATUS" = xdevelopment],
@@ -356,7 +356,7 @@ AS_IF([test "x$PACKAGE_STATUS" = xdevelopment],
 AS_IF([test "x$PLATFORM" = xosx],
     [AM_CFLAGS="$AM_CFLAGS -Qunused-arguments"])
 
-AM_CFLAGS="$AM_CFLAGS $PTHREAD_CFLAGS $glib_CFLAGS $gio_CFLAGS $curl_CFLAGS ${SQLITE_CFLAGS}"
+AM_CFLAGS="$AM_CFLAGS $PTHREAD_CFLAGS $glib_CFLAGS $gio_CFLAGS $curl_CFLAGS ${SQLITE_CFLAGS} $libstrophe_CFLAGS"
 AM_CFLAGS="$AM_CFLAGS $libnotify_CFLAGS ${GTK_CFLAGS} $python_CFLAGS"
 AM_CFLAGS="$AM_CFLAGS -DTHEMES_PATH=\"\\\"$THEMES_PATH\\\"\" -DICONS_PATH=\"\\\"$ICONS_PATH\\\"\" -DGLOBAL_PYTHON_PLUGINS_PATH=\"\\\"$GLOBAL_PYTHON_PLUGINS_PATH\\\"\" -DGLOBAL_C_PLUGINS_PATH=\"\\\"$GLOBAL_C_PLUGINS_PATH\\\"\""
 LIBS="$glib_LIBS $gio_LIBS $PTHREAD_LIBS $curl_LIBS $libnotify_LIBS $python_LIBS ${GTK_LIBS} ${SQLITE_LIBS} $LIBS"