diff --git a/internal/scanners/synw/rules.go b/internal/scanners/synw/rules.go
index 835765b0..7537d07f 100644
--- a/internal/scanners/synw/rules.go
+++ b/internal/scanners/synw/rules.go
@@ -87,7 +87,7 @@ func (a *SynapseWorkspaceScanner) getWorkspaceRules() map[string]scanners.AzureR
 			Impact:         scanners.ImpactHigh,
 			Eval: func(target interface{}, scanContext *scanners.ScanContext) (bool, string) {
 				c := target.(*armsynapse.Workspace)
-				return *c.Properties.ManagedVirtualNetwork != "default", ""
+				return c.Properties.ManagedVirtualNetwork == nil || strings.ToLower(*c.Properties.ManagedVirtualNetwork) != "default", ""
 			},
 			Url: "https://learn.microsoft.com/en-us/security/benchmark/azure/baselines/azure-synapse-analytics-security-baseline?toc=%2Fazure%2Fsynapse-analytics%2Ftoc.json",
 		},
diff --git a/internal/scanners/synw/rules_test.go b/internal/scanners/synw/rules_test.go
index a7b38e28..4f9664d9 100644
--- a/internal/scanners/synw/rules_test.go
+++ b/internal/scanners/synw/rules_test.go
@@ -92,7 +92,7 @@ func TestSynapseWorkspaceScanner_WorkspaceRules(t *testing.T) {
 			},
 		},
 		{
-			name: "SynapseWorkspaceScanner Security Profile",
+			name: "SynapseWorkspaceScanner ManagedVirtualNetwork default",
 			fields: fields{
 				rule: "synw-006",
 				target: &armsynapse.Workspace{
@@ -108,6 +108,23 @@ func TestSynapseWorkspaceScanner_WorkspaceRules(t *testing.T) {
 				result: "",
 			},
 		},
+		{
+			name: "SynapseWorkspaceScanner ManagedVirtualNetwork null",
+			fields: fields{
+				rule: "synw-006",
+				target: &armsynapse.Workspace{
+					Name: to.Ptr("synw-test"),
+					Properties: &armsynapse.WorkspaceProperties{
+						ManagedVirtualNetwork: nil,
+					},
+				},
+				scanContext: &scanners.ScanContext{},
+			},
+			want: want{
+				broken: true,
+				result: "",
+			},
+		},
 		{
 			name: "SynapseWorkspaceScanner Security Profile",
 			fields: fields{