diff --git a/independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/ClientBuilderImpl.java b/independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/ClientBuilderImpl.java
index 12e4381f7088d4..db30075de5cffe 100644
--- a/independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/ClientBuilderImpl.java
+++ b/independent-projects/resteasy-reactive/client/runtime/src/main/java/org/jboss/resteasy/reactive/client/impl/ClientBuilderImpl.java
@@ -39,6 +39,7 @@
 import io.vertx.core.http.HttpClientOptions;
 import io.vertx.core.http.HttpVersion;
 import io.vertx.core.net.JksOptions;
+import io.vertx.core.net.PfxOptions;
 import io.vertx.core.net.ProxyOptions;
 
 public class ClientBuilderImpl extends ClientBuilder {
@@ -227,16 +228,37 @@ public ClientImpl build() {
         if (keyStore != null || trustStore != null) {
             options = options.setSsl(true);
             if (keyStore != null) {
-                JksOptions jks = new JksOptions();
-                jks.setValue(keyStore);
-                jks.setPassword(new String(keystorePassword));
-                options = options.setKeyStoreOptions(jks);
+                String keyStoreType = this.keyStore.getType();
+                if ("PKCS12".equals(keyStoreType)) {
+                    PfxOptions pks = new PfxOptions();
+                    pks.setValue(keyStore);
+                    pks.setPassword(new String(keystorePassword));
+                    options = options.setKeyCertOptions(pks);
+                } else if ("JKS".equals(keyStoreType)) {
+                    JksOptions jks = new JksOptions();
+                    jks.setValue(keyStore);
+                    jks.setPassword(new String(keystorePassword));
+                    options = options.setKeyCertOptions(jks);
+                } else {
+                    throw new IllegalStateException("Unsupported key store type " + keyStoreType);
+                }
+
             }
             if (trustStore != null) {
-                JksOptions jks = new JksOptions();
-                jks.setValue(trustStore);
-                jks.setPassword(new String(effectiveTrustStorePassword));
-                options.setTrustStoreOptions(jks);
+                String trustStoreType = this.trustStore.getType();
+                if ("PKCS12".equals(trustStoreType)) {
+                    PfxOptions pks = new PfxOptions();
+                    pks.setValue(trustStore);
+                    pks.setPassword(new String(effectiveTrustStorePassword));
+                } else if ("JKS".equals(trustStoreType)) {
+                    JksOptions jks = new JksOptions();
+                    jks.setValue(trustStore);
+                    jks.setPassword(new String(effectiveTrustStorePassword));
+                    options.setTrustOptions(jks);
+                } else {
+                    throw new IllegalStateException("Unsupported trust store type " + trustStoreType);
+                }
+
             }
         }