diff --git a/packages/kn-plugin-workflow/pkg/specs/openapi_minifier.go b/packages/kn-plugin-workflow/pkg/specs/openapi_minifier.go
index 7e86a83af89..57bbe30b2ff 100644
--- a/packages/kn-plugin-workflow/pkg/specs/openapi_minifier.go
+++ b/packages/kn-plugin-workflow/pkg/specs/openapi_minifier.go
@@ -24,6 +24,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"path"
 	"path/filepath"
 	"strings"
 
@@ -67,7 +68,7 @@ func (m *OpenApiMinifier) Minify() (map[string]string, error) {
 
 	m.findSubflowsFiles(m.params)
 
-	if err := m.processFunctions(); err != nil {
+	if err := m.fetchSpecFromFunctions(); err != nil {
 		return nil, err
 	}
 
@@ -83,9 +84,9 @@ func (m *OpenApiMinifier) Minify() (map[string]string, error) {
 	return minifySpecsFiles, nil
 }
 
-func (m *OpenApiMinifier) processFunctions() error {
+func (m *OpenApiMinifier) fetchSpecFromFunctions() error {
 	for _, workflowFile := range m.workflows {
-		err := m.processFunction(workflowFile)
+		err := m.fetchSpecFromFunction(workflowFile)
 		if err != nil {
 			return err
 		}
@@ -93,7 +94,7 @@ func (m *OpenApiMinifier) processFunctions() error {
 	return nil
 }
 
-func (m *OpenApiMinifier) processFunction(workflowFile string) error {
+func (m *OpenApiMinifier) fetchSpecFromFunction(workflowFile string) error {
 	workflow, err := m.GetWorkflow(workflowFile)
 	if err != nil {
 		return err
@@ -107,7 +108,7 @@ func (m *OpenApiMinifier) processFunction(workflowFile string) error {
 
 	for _, function := range workflow.Functions {
 		if strings.HasPrefix(function.Operation, relativePath) {
-			trimmedPrefix := strings.TrimPrefix(function.Operation, relativePath+string(os.PathSeparator))
+			trimmedPrefix := strings.TrimPrefix(function.Operation, relativePath+"/")
 			if !strings.Contains(trimmedPrefix, "#") {
 				return fmt.Errorf("Invalid operation format in function: %s", function.Operation)
 			}
@@ -115,7 +116,7 @@ func (m *OpenApiMinifier) processFunction(workflowFile string) error {
 			if len(parts) != 2 {
 				return fmt.Errorf("❌ ERROR: Invalid operation format: %s", function.Operation)
 			}
-			apiFileName := parts[0]
+			apiFileName := path.Base(parts[0])
 			operation := parts[1]
 
 			if _, ok := m.operations[apiFileName]; !ok {
diff --git a/packages/kn-plugin-workflow/pkg/specs/openapi_minifier_test.go b/packages/kn-plugin-workflow/pkg/specs/openapi_minifier_test.go
index 6a015800877..67c00ecad9b 100644
--- a/packages/kn-plugin-workflow/pkg/specs/openapi_minifier_test.go
+++ b/packages/kn-plugin-workflow/pkg/specs/openapi_minifier_test.go
@@ -214,7 +214,7 @@ func checkResult(t *testing.T, test minifyTest, minifiedFiles map[string]string)
 		minified := minifiedFiles[file]
 		data, err := os.ReadFile(minified)
 		if err != nil {
-			t.Fatalf("Error reading minified file: %v", err)
+			t.Fatalf("Error reading minified file %s: %v", minified, err)
 		}
 		doc, err := openapi3.NewLoader().LoadFromData(data)
 		for _, value := range doc.Paths.Map() {
@@ -234,7 +234,7 @@ func checkResult(t *testing.T, test minifyTest, minifiedFiles map[string]string)
 func parseFunctions(t *testing.T, functions map[string]sets.Set[string], workflow *v1alpha08.Flow, test minifyTest) {
 	for _, function := range workflow.Functions {
 		if strings.HasPrefix(function.Operation, test.specsDir) {
-			trimmedPrefix := strings.TrimPrefix(function.Operation, test.specsDir+string(os.PathSeparator))
+			trimmedPrefix := strings.TrimPrefix(function.Operation, test.specsDir+"/")
 			if !strings.Contains(trimmedPrefix, "#") {
 				t.Fatalf("Invalid operation format in function: %s", function.Operation)
 			}
@@ -242,7 +242,7 @@ func parseFunctions(t *testing.T, functions map[string]sets.Set[string], workflo
 			if len(parts) != 2 {
 				t.Fatalf("Invalid operation format: %s", function.Operation)
 			}
-			apiFileName := parts[0]
+			apiFileName := path.Base(parts[0])
 			operation := parts[1]
 
 			if _, ok := functions[apiFileName]; !ok {