diff --git a/configure.ac b/configure.ac
index 61eb8ef..1daa614 100644
--- a/configure.ac
+++ b/configure.ac
@@ -113,6 +113,7 @@
             CYTHON=false
 fi
 if [test "x$CYTHON" != "xfalse"]; then
+            PKG_PROG_PKG_CONFIG
             AC_MSG_CHECKING([for libplist Cython bindings])
             CYTHON_PLIST_INCLUDE_DIR=$($PKG_CONFIG --variable=includedir libplist)/plist/cython
             if [test ! -d "$CYTHON_PLIST_INCLUDE_DIR"]; then