diff --git a/packages/kbn-monaco/src/esql/lib/ast/definitions/functions.ts b/packages/kbn-monaco/src/esql/lib/ast/definitions/functions.ts
index 898c888799cff..46712fed700bd 100644
--- a/packages/kbn-monaco/src/esql/lib/ast/definitions/functions.ts
+++ b/packages/kbn-monaco/src/esql/lib/ast/definitions/functions.ts
@@ -592,7 +592,7 @@ export const evalFunctionsDefinitions: FunctionDefinition[] = [
           { name: 'condition', type: 'boolean' },
           { name: 'value', type: 'any' },
         ],
-        minParams: 3,
+        minParams: 2,
         returnType: 'any',
         examples: [
           `from index | eval type = case(languages <= 1, "monolingual", languages <= 2, "bilingual", "polyglot")`,
diff --git a/packages/kbn-monaco/src/esql/lib/ast/validation/esql_validation_meta_tests.json b/packages/kbn-monaco/src/esql/lib/ast/validation/esql_validation_meta_tests.json
index 4da93337bacfc..39d2ccd562c06 100644
--- a/packages/kbn-monaco/src/esql/lib/ast/validation/esql_validation_meta_tests.json
+++ b/packages/kbn-monaco/src/esql/lib/ast/validation/esql_validation_meta_tests.json
@@ -563,11 +563,11 @@
       "error": false
     },
     {
-      "query": "row var = case(true, \"a\", \"a\")",
+      "query": "row var = case(true, \"a\")",
       "error": false
     },
     {
-      "query": "row case(true, \"a\", \"a\")",
+      "query": "row case(true, \"a\")",
       "error": false
     },
     {
@@ -4871,11 +4871,11 @@
       "error": true
     },
     {
-      "query": "from a_index | eval var = case(booleanField, stringField, stringField)",
+      "query": "from a_index | eval var = case(booleanField, stringField)",
       "error": false
     },
     {
-      "query": "from a_index | eval case(booleanField, stringField, stringField)",
+      "query": "from a_index | eval case(booleanField, stringField)",
       "error": false
     },
     {