diff --git a/internals/plan/extensions_test.go b/internals/plan/extensions_test.go
index 2cbd8b86..dd56b6af 100644
--- a/internals/plan/extensions_test.go
+++ b/internals/plan/extensions_test.go
@@ -190,7 +190,7 @@ var extensionTests = []struct {
 					a: a
 					b: b`,
 	}},
-	error: "cannot validate layer section .* cannot accept entry not starting .*",
+	error: ".*cannot accept entry not starting.*",
 }, {
 	summary: "Load file layers with section validation failure #2",
 	extensions: []extension{{
@@ -209,7 +209,7 @@ var extensionTests = []struct {
 			x-field:
 				x1:`,
 	}},
-	error: "cannot validate layer section .* cannot have nil entry .*",
+	error: ".*cannot have nil entry.*",
 }, {
 	summary: "Load file layers failed plan validation",
 	extensions: []extension{{
@@ -244,7 +244,7 @@ var extensionTests = []struct {
 					a: a
 					b: b`,
 	}},
-	error: "cannot validate plan section .* cannot find .* as required by .*",
+	error: ".*cannot find.*",
 }, {
 	summary: "Check empty section omits entry",
 	extensions: []extension{{
diff --git a/internals/plan/plan.go b/internals/plan/plan.go
index df5a54af..b625eee4 100644
--- a/internals/plan/plan.go
+++ b/internals/plan/plan.go
@@ -954,10 +954,10 @@ func (layer *Layer) Validate() error {
 		}
 	}
 
-	for field, section := range layer.Sections {
+	for _, section := range layer.Sections {
 		err := section.Validate()
 		if err != nil {
-			return fmt.Errorf("cannot validate layer section %q: %w", field, err)
+			return err
 		}
 	}
 
@@ -1055,10 +1055,10 @@ func (p *Plan) Validate() error {
 	}
 
 	// Each section extension must validate the combined plan.
-	for field, extension := range sectionExtensions {
+	for _, extension := range sectionExtensions {
 		err = extension.ValidatePlan(p)
 		if err != nil {
-			return fmt.Errorf("cannot validate plan section %q: %w", field, err)
+			return err
 		}
 	}