diff --git a/scripts/ocsp-stapling.test b/scripts/ocsp-stapling.test
index 3651624fa..778c7151e 100755
--- a/scripts/ocsp-stapling.test
+++ b/scripts/ocsp-stapling.test
@@ -161,13 +161,13 @@ server=login.live.com
 ca=certs/external/baltimore-cybertrust-root.pem
 
 [ ! -x ./examples/client/client ] && echo -e "\n\nClient doesn't exist" && exit 1
-./examples/client/client -? 2>&1 | grep -- 'Client not compiled in!'
+./examples/client/client '-?' 2>&1 | grep -- 'Client not compiled in!'
 if [ $? -eq 0 ]; then
     exit 0
 fi
 
 # check if supported key size is large enough to handle 4096 bit RSA
-size=`./examples/client/client -? | grep "Max RSA key"`
+size=`./examples/client/client '-?' | grep "Max RSA key"`
 size=`echo ${size//[^0-9]/}`
 if [ ! -z "$size" ]; then
     printf 'check on max key size of %d ...' $size
@@ -231,7 +231,7 @@ RESULT=$?
 
 # Test with example server
 
-./examples/server/server -? 2>&1 | grep -- 'Server not compiled in!'
+./examples/server/server '-?' 2>&1 | grep -- 'Server not compiled in!'
 if [ $? -eq 0 ]; then
     exit 0
 fi
diff --git a/scripts/ocsp-stapling2.test b/scripts/ocsp-stapling2.test
index b1c64f65e..f162365ab 100755
--- a/scripts/ocsp-stapling2.test
+++ b/scripts/ocsp-stapling2.test
@@ -177,7 +177,7 @@ trap cleanup EXIT INT TERM HUP
 [ ! -x ./examples/client/client ] && echo -e "\n\nClient doesn't exist" && exit 1
 
 # check if supported key size is large enough to handle 4096 bit RSA
-size=`./examples/client/client -? | grep "Max RSA key"`
+size=`./examples/client/client '-?' | grep "Max RSA key"`
 size=`echo ${size//[^0-9]/}`
 if [ ! -z "$size" ]; then
     printf 'check on max key size of %d ...' $size
diff --git a/scripts/psk.test b/scripts/psk.test
index 6693956cd..d11ac59b5 100755
--- a/scripts/psk.test
+++ b/scripts/psk.test
@@ -62,11 +62,11 @@ do_trap() {
 trap do_trap INT TERM
 
 [ ! -x ./examples/client/client ] && echo -e "\n\nClient doesn't exist" && exit 1
-./examples/client/client -? 2>&1 | grep -- 'Client not compiled in!'
+./examples/client/client '-?' 2>&1 | grep -- 'Client not compiled in!'
 if [ $? -eq 0 ]; then
     exit 0
 fi
-./examples/server/server -? 2>&1 | grep -- 'Server not compiled in!'
+./examples/server/server '-?' 2>&1 | grep -- 'Server not compiled in!'
 if [ $? -eq 0 ]; then
     exit 0
 fi
diff --git a/scripts/resume.test b/scripts/resume.test
index cbae7ebbb..35d05e1f2 100755
--- a/scripts/resume.test
+++ b/scripts/resume.test
@@ -49,7 +49,7 @@ do_test() {
     #make sure we support session resumption (!NO_SESSION_CACHE)
     # Check the client for the extended master secret disable option. If
     # present we need to run the test twice.
-    options_check=`./examples/client/client -?`
+    options_check=`./examples/client/client '-?'`
     case "$options_check" in
     *$resume_sup_string*)
         echo -e "\nResume test supported";;
@@ -111,15 +111,15 @@ do_test() {
 
 trap do_trap INT TERM
 
-./examples/client/client -? 2>&1 | grep -- 'Client not compiled in!'
+./examples/client/client '-?' 2>&1 | grep -- 'Client not compiled in!'
 if [ $? -ne 0 ]; then
-    ./examples/server/server -? 2>&1 | grep -- 'Server not compiled in!'
+    ./examples/server/server '-?' 2>&1 | grep -- 'Server not compiled in!'
     if [ $? -ne 0 ]; then
         RUN_TEST="Y"
     fi
 fi
 
-./examples/client/client -? 2>&1 | grep -- 'Resume session'
+./examples/client/client '-?' 2>&1 | grep -- 'Resume session'
 if [ $? -ne 0 ]; then
     RUN_TEST="Y"
 fi
diff --git a/scripts/tls13.test b/scripts/tls13.test
index 7beb9a56b..df67a3963 100755
--- a/scripts/tls13.test
+++ b/scripts/tls13.test
@@ -70,11 +70,11 @@ do_trap() {
 trap do_trap INT TERM
 
 [ ! -x ./examples/client/client ] && echo -e "\n\nClient doesn't exist" && exit 1
-./examples/client/client -? 2>&1 | grep -- 'Client not compiled in!'
+./examples/client/client '-?' 2>&1 | grep -- 'Client not compiled in!'
 if [ $? -eq 0 ]; then
     exit 0
 fi
-./examples/server/server -? 2>&1 | grep -- 'Server not compiled in!'
+./examples/server/server '-?' 2>&1 | grep -- 'Server not compiled in!'
 if [ $? -eq 0 ]; then
     exit 0
 fi