diff --git a/peridot/builder/v1/workflow/arch.go b/peridot/builder/v1/workflow/arch.go
index 78ecd9b..9512be3 100644
--- a/peridot/builder/v1/workflow/arch.go
+++ b/peridot/builder/v1/workflow/arch.go
@@ -687,8 +687,15 @@ func (c *Controller) BuildArchActivity(ctx context.Context, projectId string, pa
 		c.log.Infof("no extra options to process for package")
 	}
 
-	extraOptions.DisabledModules = disableModules
-	extraOptions.Modules = enableModules
+	if extraOptions.DisabledModules == nil {
+		extraOptions.DisabledModules = []string{}
+	}
+	extraOptions.DisabledModules = append(extraOptions.DisabledModules, disableModules...)
+
+	if extraOptions.Modules == nil {
+		extraOptions.Modules = []string{}
+	}
+	extraOptions.Modules = append(extraOptions.Modules, enableModules...)
 
 	hostArch := os.Getenv("REAL_BUILD_ARCH")
 	err = c.writeMockConfig(&project, packageVersion, extraOptions, arch, hostArch, pkgGroup)
diff --git a/peridot/builder/v1/workflow/srpm.go b/peridot/builder/v1/workflow/srpm.go
index 4da0284..9639d0d 100644
--- a/peridot/builder/v1/workflow/srpm.go
+++ b/peridot/builder/v1/workflow/srpm.go
@@ -425,8 +425,15 @@ func (c *Controller) BuildSRPMActivity(ctx context.Context, upstreamPrefix strin
 		c.log.Infof("no extra options to process for package")
 	}
 
-	extraOptions.DisabledModules = disableModules
-	extraOptions.Modules = enableModules
+	if extraOptions.DisabledModules == nil {
+		extraOptions.DisabledModules = []string{}
+	}
+	extraOptions.DisabledModules = append(extraOptions.DisabledModules, disableModules...)
+
+	if extraOptions.Modules == nil {
+		extraOptions.Modules = []string{}
+	}
+	extraOptions.Modules = append(extraOptions.Modules, enableModules...)
 
 	hostArch := os.Getenv("REAL_BUILD_ARCH")
 	extraOptions.EnableNetworking = true