diff --git a/executable_semantics/testdata/name_lookup/global_shadow.carbon b/executable_semantics/testdata/name_lookup/global_shadow.carbon
index 1cdfe4d794da..4939b2a2619b 100644
--- a/executable_semantics/testdata/name_lookup/global_shadow.carbon
+++ b/executable_semantics/testdata/name_lookup/global_shadow.carbon
@@ -13,7 +13,7 @@ package ExecutableSemanticsTest api;
 
 var x: i32 = 0;
 
-fn main() -> i32 {
+fn Main() -> i32 {
   var x: i32 = 0;
   return 0;
 }
diff --git a/executable_semantics/testdata/name_lookup/match_shadow.carbon b/executable_semantics/testdata/name_lookup/match_shadow.carbon
index 7ee6c157c1db..0502ae6279d0 100644
--- a/executable_semantics/testdata/name_lookup/match_shadow.carbon
+++ b/executable_semantics/testdata/name_lookup/match_shadow.carbon
@@ -13,7 +13,7 @@ package ExecutableSemanticsTest api;
 
 var x: i32 = 0;
 
-fn main() -> i32 {
+fn Main() -> i32 {
   match (0) {
     case x: i32 => {
       var x: i32 = 0;