diff --git a/conf/distro/include/tcmode-external.inc b/conf/distro/include/tcmode-external.inc
index 4d84ba3..4b41a85 100644
--- a/conf/distro/include/tcmode-external.inc
+++ b/conf/distro/include/tcmode-external.inc
@@ -47,6 +47,7 @@ PNBLACKLIST[gcc-sanitizers] = "not building with an external toolchain"
 PNBLACKLIST[gcc-source] = "not building with an external toolchain"
 PNBLACKLIST[libgcc-initial] = "not building with an external toolchain"
 PNBLACKLIST[libgcc] = "not building with an external toolchain"
+PNBLACKLIST[libgfortran] = "not building with an external toolchain"
 
 PNBLACKLIST_DYNAMIC += "\
     ${MLPREFIX}gcc-cross-${TARGET_ARCH} \