diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 1e7107456..c2d663523 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -91,10 +91,7 @@
 set -eu
 
 pre_check_environment () {
-    if [ "$( uname )" != "Linux" ]; then
-        echo "This script only works in Linux" >&2
-        exit 1
-    elif [ -d library -a -d include -a -d tests ]; then :; else
+    if [ -d library -a -d include -a -d tests ]; then :; else
         echo "Must be run from mbed TLS root" >&2
         exit 1
     fi
@@ -1190,14 +1187,14 @@ run_all_components () {
     run_component component_test_aes_fewer_tables
     run_component component_test_aes_rom_tables
     run_component component_test_aes_fewer_tables_and_rom_tables
-    if uname -a | grep -F Linux >/dev/null; then
-        run_component component_test_make_shared
-    fi
-    if uname -a | grep -F x86_64 >/dev/null; then
-        run_component component_test_m32_o0
-        run_component component_test_m32_o1
-        run_component component_test_mx32
-    fi
+    run_component component_test_make_shared
+    case $(uname -m) in
+        amd64|x86_64)
+            run_component component_test_m32_o0
+            run_component component_test_m32_o1
+            run_component component_test_mx32
+            ;;
+    esac
     run_component component_test_have_int32
     run_component component_test_have_int64
     run_component component_test_no_udbl_division
@@ -1208,12 +1205,8 @@ run_all_components () {
     run_component component_build_armcc
     run_component component_test_allow_sha1
     run_component component_build_mingw
-    # MemSan currently only available on Linux 64 bits
-    if uname -a | grep 'Linux.*x86_64' >/dev/null; then
-        run_component component_test_memsan
-    else # no MemSan
-        run_component component_test_memcheck
-    fi
+    run_component component_test_memsan
+    run_component component_test_memcheck
     run_component component_test_cmake_out_of_source
 
     # More small things
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 2ccecc4b1..26830fe63 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -167,7 +167,7 @@ requires_config_disabled() {
 get_config_value_or_default() {
     NAME="$1"
     DEF_VAL=$( grep ".*#define.*${NAME}" ../include/mbedtls/config.h |
-               sed 's/^.*\s\([0-9]*\)$/\1/' )
+               sed 's/^.* \([0-9]*\)$/\1/' )
     ../scripts/config.pl get $NAME || echo "$DEF_VAL"
 }