diff --git a/.ci/build.sh b/.ci/build.sh
index 6cb5467f3..b0c22f671 100644
--- a/.ci/build.sh
+++ b/.ci/build.sh
@@ -190,7 +190,9 @@ then
 			# Call build with the correct MSYSTEM.
 			echo [-] Switching to MSYSTEM [$msys]
 			cd "$cwd"
-			CHERE_INVOKING=yes MSYSTEM="$msys" bash -lc 'exec "'"$0"'" -b "'"$package_name"'" "'"$arch"'" '"$cmake_flags"
+			strip_arg=
+			[ $strip -ne 0 ] && strip_arg="-t "
+			CHERE_INVOKING=yes MSYSTEM="$msys" bash -lc 'exec "'"$0"'" -b "'"$package_name"'" "'"$arch"'" '"$strip_arg""$cmake_flags"
 			exit $?
 		fi
 	else