diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
index be35976665e2..3bb9d43238d5 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
@@ -5657,6 +5657,7 @@ protected boolean isReservedWord(String word) {
      */
     protected String getOrGenerateOperationId(Operation operation, String path, String httpMethod) {
         String operationId = operation.getOperationId();
+
         if (StringUtils.isBlank(operationId)) {
             String tmpPath = path;
             tmpPath = tmpPath.replaceAll("\\{", "");
@@ -5681,6 +5682,10 @@ protected String getOrGenerateOperationId(Operation operation, String path, Stri
             LOGGER.warn("Empty operationId found for path: {} {}. Renamed to auto-generated operationId: {}", httpMethod, path, operationId);
         }
 
+        if (operationIdNameMapping.containsKey(operationId)) {
+            return operationIdNameMapping.get(operationId);
+        }
+
         // remove prefix in operationId
         if (removeOperationIdPrefix) {
             // The prefix is everything before the removeOperationIdPrefixCount occurrence of removeOperationIdPrefixDelimiter
@@ -5693,13 +5698,8 @@ protected String getOrGenerateOperationId(Operation operation, String path, Stri
                 operationId = String.join(removeOperationIdPrefixDelimiter, Arrays.copyOfRange(components, component_number, components.length));
             }
         }
-        operationId = removeNonNameElementToCamelCase(operationId);
 
-        if (operationIdNameMapping.containsKey(operationId)) {
-            return operationIdNameMapping.get(operationId);
-        } else {
-            return toOperationId(operationId);
-        }
+        return toOperationId(removeNonNameElementToCamelCase(operationId));
     }
 
     /**
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/DefaultCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/DefaultCodegenTest.java
index c01501af6ac7..4fe17e2dd39f 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/DefaultCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/DefaultCodegenTest.java
@@ -2326,6 +2326,20 @@ public void schemaMapping() {
         Assertions.assertEquals(codegenModel.vars.get(0).getBaseType(), "TypeAlias");
     }
 
+    @Test
+    public void operationIdNameMapping() {
+        DefaultCodegen codegen = new DefaultCodegen();
+        codegen.operationIdNameMapping.put("edge case !@# 123", "fix_edge_case");
+
+        OpenAPI openAPI = new OpenAPIParser()
+                .readLocation("src/test/resources/3_0/type-alias.yaml", null, new ParseOptions()).getOpenAPI();
+        codegen.setOpenAPI(openAPI);
+
+        CodegenOperation codegenOperation = codegen.fromOperation("/type-alias", "get", openAPI.getPaths().get("/type-alias").getGet(), null);
+        Assertions.assertEquals(codegenOperation.operationId, "fix_edge_case");
+        Assertions.assertEquals(codegen.getOrGenerateOperationId(openAPI.getPaths().get("/type-alias").getGet(), "/type-alias", "get"), "fix_edge_case");
+    }
+
     @Test
     public void modelWithPrefixDoNotContainInheritedVars() {
         DefaultCodegen codegen = new DefaultCodegen();
diff --git a/modules/openapi-generator/src/test/resources/3_0/type-alias.yaml b/modules/openapi-generator/src/test/resources/3_0/type-alias.yaml
index 5ae62c68bc97..b2c506f63431 100644
--- a/modules/openapi-generator/src/test/resources/3_0/type-alias.yaml
+++ b/modules/openapi-generator/src/test/resources/3_0/type-alias.yaml
@@ -6,6 +6,7 @@ info:
 paths:
   /type-alias:
     get:
+      operationId: edge case !@# 123
       responses:
         200:
           description: OK