diff --git a/configure.ac b/configure.ac
index e59cb56..cd8cb72 100644
--- a/configure.ac
+++ b/configure.ac
@@ -85,7 +85,7 @@ AC_HEADER_STDC([])
 
 AX_TLS
 
-COMEDILIB_CFLAGS="$COMEDILIB_CFLAGS -I\$(top_srcdir)/include $COMEDILIB_DEBUG"
+COMEDILIB_CFLAGS="$COMEDILIB_CFLAGS -I\$(top_srcdir)/include -I\$(top_builddir)/include $COMEDILIB_DEBUG"
 COMEDILIB_LIBS="$COMEDILIB_LIBS \$(top_builddir)/lib/libcomedi.la -lm"
 AC_SUBST(COMEDILIB_CFLAGS)
 AC_SUBST(COMEDILIB_LIBS)