diff --git a/tests/test-rem b/tests/test-rem
index 725a0fc5..5a7f3ddb 100644
--- a/tests/test-rem
+++ b/tests/test-rem
@@ -370,7 +370,7 @@ fi
 ../src/remind -cu '-i$SuppressLRM=1' ../tests/utf-8.rem 1 Nov 2019 >> ../tests/test.out
 
 # Remove references to SysInclude, which is build-specific
-fgrep -v '$SysInclude' < ../tests/test.out > ../tests/test.out.1 && mv -f ../tests/test.out.1 ../tests/test.out
+grep -F -v '$SysInclude' < ../tests/test.out > ../tests/test.out.1 && mv -f ../tests/test.out.1 ../tests/test.out
 cmp -s ../tests/test.out ../tests/test.cmp
 if [ "$?" = "0" ]; then
    echo "Remind:  Acceptance test PASSED"