diff --git a/tests/test_compress.sh b/tests/test_compress.sh
index 61d20ce9..0aa81001 100755
--- a/tests/test_compress.sh
+++ b/tests/test_compress.sh
@@ -130,8 +130,8 @@ test_xz -4
 
 test_filter()
 {
-	grep "define HAVE_ENCODER_$1" ../config.h > /dev/null || return
-	grep "define HAVE_DECODER_$1" ../config.h > /dev/null || return
+	grep "define HAVE_ENCODER_$1 1" ../config.h > /dev/null || return
+	grep "define HAVE_DECODER_$1 1" ../config.h > /dev/null || return
 	shift
 	test_xz "$@" --lzma2=dict=64KiB,nice=32,mode=fast
 }
diff --git a/tests/test_files.sh b/tests/test_files.sh
index 64d73081..e42af918 100755
--- a/tests/test_files.sh
+++ b/tests/test_files.sh
@@ -35,7 +35,7 @@ fi
 EXIT_STATUS=0
 have_feature()
 {
-	grep "define HAVE_$1" ../config.h > /dev/null && return 0
+	grep "define HAVE_$1 1" ../config.h > /dev/null && return 0
 	printf '%s: Skipping because HAVE_%s is not enabled\n' "$2" "$1"
 	EXIT_STATUS=77
 	return 1