diff --git a/debian/qualify-clang.sh b/debian/qualify-clang.sh
index 4d1efa12..4e7ea94a 100644
--- a/debian/qualify-clang.sh
+++ b/debian/qualify-clang.sh
@@ -275,6 +275,7 @@ done
 
 echo "If the following fails, try setting an environment variable such as:"
 echo "OBJC_INCLUDE_PATH=/usr/lib/gcc/x86_64-linux-gnu/7/include"
+echo "libobjc-7-dev should be also installed"
 echo "#include <objc/objc.h>" > foo.m
 clang-$VERSION -c foo.m