diff --git a/client/deployment/src/main/resources/templates/libraries/microprofile/api.qute b/client/deployment/src/main/resources/templates/libraries/microprofile/api.qute
index 218d5a5e4..8f1a18394 100644
--- a/client/deployment/src/main/resources/templates/libraries/microprofile/api.qute
+++ b/client/deployment/src/main/resources/templates/libraries/microprofile/api.qute
@@ -18,7 +18,7 @@ import {imp.import};
   */
 {/if}
 @jakarta.ws.rs.Path("{#if useAnnotatedBasePath.or(false)}{contextPath}{/if}{commonPath}")
-@org.eclipse.microprofile.rest.client.inject.RegisterRestClient({#if !defaultServerUrl.or('') == ''}baseUri="{defaultServerUrl}", {/if}configKey="{configKey}")
+@org.eclipse.microprofile.rest.client.inject.RegisterRestClient({#if defaultServerUrl.or('') != ''}baseUri="{defaultServerUrl}", {/if}configKey="{configKey}")
 @io.quarkiverse.openapi.generator.annotations.GeneratedClass(value="{openapi:parseUri(inputSpec)}", tag = "{baseName}")
 {#if enable-security-generation && openapi:hasAuthMethods(operations) }
 @org.eclipse.microprofile.rest.client.annotation.RegisterProvider({package}.auth.CompositeAuthenticationProvider.class)
diff --git a/client/integration-tests/change-custom-template-directory/src/main/custom/templates/api.qute b/client/integration-tests/change-custom-template-directory/src/main/custom/templates/api.qute
index 6e60df751..a6557bf17 100644
--- a/client/integration-tests/change-custom-template-directory/src/main/custom/templates/api.qute
+++ b/client/integration-tests/change-custom-template-directory/src/main/custom/templates/api.qute
@@ -35,7 +35,7 @@ import io.quarkiverse.openapi.generator.annotations.GeneratedParam;
   */
 {/if}
 @Path("{commonPath}")
-@RegisterRestClient({#if !defaultServerUrl.or('') == ''}baseUri="{defaultServerUrl}",{/if} configKey="{configKey}")
+@RegisterRestClient({#if defaultServerUrl.or('') != ''}baseUri="{defaultServerUrl}",{/if} configKey="{configKey}")
 @GeneratedClass(value="{openapi:parseUri(inputSpec)}", tag = "{baseName}")
 {#if openapi:hasAuthMethods(operations)}
 @RegisterProvider(CompositeAuthenticationProvider.class)
diff --git a/client/integration-tests/custom-templates/src/main/resources/templates/api.qute b/client/integration-tests/custom-templates/src/main/resources/templates/api.qute
index d037a0993..b02877f0b 100644
--- a/client/integration-tests/custom-templates/src/main/resources/templates/api.qute
+++ b/client/integration-tests/custom-templates/src/main/resources/templates/api.qute
@@ -35,7 +35,7 @@ import io.quarkiverse.openapi.generator.annotations.GeneratedParam;
   */
 {/if}
 @Path("{commonPath}")
-@RegisterRestClient({#if !defaultServerUrl.or('') == ''}baseUri="{defaultServerUrl}", {/if}configKey="{configKey}")
+@RegisterRestClient({#if defaultServerUrl.or('') != ''}baseUri="{defaultServerUrl}", {/if}configKey="{configKey}")
 @GeneratedClass(value="{openapi:parseUri(inputSpec)}", tag = "{baseName}")
 {#if openapi:hasAuthMethods(operations)}
 @RegisterProvider(CompositeAuthenticationProvider.class)