diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index bd44204..d7db8ab 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -293,6 +293,69 @@
     unset ciphersuite
 }
 
+adapt_cmd_for_psk () {
+    case "$2" in
+        *openssl*) s='-psk abc123 -nocert';;
+        *gnutls-*) s='--pskkey=abc123';;
+        *) s='psk=abc123';;
+    esac
+    eval $1='"$2 $s"'
+    unset s
+}
+
+# maybe_adapt_for_psk [RUN_TEST_OPTION...]
+# If running in a PSK-only build, maybe adapt the test to use a pre-shared key.
+#
+# If not running in a PSK-only build, do nothing.
+# If the test looks like it doesn't use a pre-shared key but can run with a
+# pre-shared key, pass a pre-shared key. If the test looks like it can't run
+# with a pre-shared key, skip it. If the test looks like it's already using
+# a pre-shared key, do nothing.
+#
+# This code does not consider builds with ECDH-PSK or RSA-PSK.
+#
+# Inputs:
+# * $CLI_CMD, $SRV_CMD, $PXY_CMD: client/server/proxy commands.
+# * $PSK_ONLY: YES if running in a PSK-only build (no asymmetric key exchanges).
+# * "$@": options passed to run_test.
+#
+# Outputs:
+# * $CLI_CMD, $SRV_CMD: may be modified to add PSK-relevant arguments.
+# * $SKIP_NEXT: set to YES if the test can't run with PSK.
+maybe_adapt_for_psk() {
+    if [ "$PSK_ONLY" != "YES" ]; then
+        return
+    fi
+    if [ "$SKIP_NEXT" = "YES" ]; then
+        return
+    fi
+    case "$CLI_CMD $SRV_CMD" in
+        *[-_\ =]psk*|*[-_\ =]PSK*)
+            return;;
+        *force_ciphersuite*)
+            # The test case forces a non-PSK cipher suite. In some cases, a
+            # PSK cipher suite could be substituted, but we're not ready for
+            # that yet.
+            SKIP_NEXT="YES"
+            return;;
+        *\ auth_mode=*|*[-_\ =]crt[_=]*)
+            # The test case involves certificates. PSK won't do.
+            SKIP_NEXT="YES"
+            return;;
+    esac
+    adapt_cmd_for_psk CLI_CMD "$CLI_CMD"
+    adapt_cmd_for_psk SRV_CMD "$SRV_CMD"
+}
+
+case " $CONFIGS_ENABLED " in
+    *\ MBEDTLS_KEY_EXCHANGE_[^P]*) PSK_ONLY="NO";;
+    *\ MBEDTLS_KEY_EXCHANGE_P[^S]*) PSK_ONLY="NO";;
+    *\ MBEDTLS_KEY_EXCHANGE_PS[^K]*) PSK_ONLY="NO";;
+    *\ MBEDTLS_KEY_EXCHANGE_PSK[^_]*) PSK_ONLY="NO";;
+    *\ MBEDTLS_KEY_EXCHANGE_PSK_ENABLED\ *) PSK_ONLY="YES";;
+    *) PSK_ONLY="NO";;
+esac
+
 # skip next test if OpenSSL doesn't support FALLBACK_SCSV
 requires_openssl_with_fallback_scsv() {
     if [ -z "${OPENSSL_HAS_FBSCSV:-}" ]; then
@@ -1166,6 +1229,9 @@
     maybe_requires_ciphersuite_enabled "$SRV_CMD" "$@"
     maybe_requires_ciphersuite_enabled "$CLI_CMD" "$@"
 
+    # If we're in a PSK-only build and the test can be adapted to PSK, do that.
+    maybe_adapt_for_psk "$@"
+
     # should we skip?
     if [ "X$SKIP_NEXT" = "XYES" ]; then
         SKIP_NEXT="NO"