diff --git a/compiler/forget/src/MiddleEnd/SketchyCodeCheck.ts b/compiler/forget/src/MiddleEnd/SketchyCodeCheck.ts
index 904e3e676d..341e5a4a13 100644
--- a/compiler/forget/src/MiddleEnd/SketchyCodeCheck.ts
+++ b/compiler/forget/src/MiddleEnd/SketchyCodeCheck.ts
@@ -53,17 +53,18 @@ export function run(
   const funcBody = func.get("body");
 
   if (context.opts.flags.bailOnCapitalizedFunctionCalls) {
+    function isValidFunctionCallName(name: string): boolean {
+      return (
+        ALLOWED_CAPITALIZED_STDLIB_FUNCTIONS.has(name) ||
+        context.opts.allowedCapitalizedUserFunctions.has(name) ||
+        !/^[A-Z]/.test(name)
+      );
+    }
+
     funcBody.traverse({
       CallExpression(path) {
         const callee = path.get("callee");
         if (t.isIdentifier(callee.node)) {
-          const name = callee.node.name;
-          if (
-            ALLOWED_CAPITALIZED_STDLIB_FUNCTIONS.has(name) ||
-            context.opts.allowedCapitalizedUserFunctions.has(name)
-          ) {
-            return;
-          }
           // Allow `Module().method()`;
           if (
             t.isMemberExpression(path.parent) ||
@@ -71,13 +72,28 @@ export function run(
           ) {
             return;
           }
-          if (/^[A-Z]/.test(name)) {
+          const name = callee.node.name;
+          if (!isValidFunctionCallName(name)) {
             context.bailout("BailOnCapitalizedFunctionCalls", {
               code: "E0018",
               path: callee,
               context: null,
             });
           }
+        } else if (
+          t.isMemberExpression(callee.node) ||
+          t.isOptionalMemberExpression(callee.node)
+        ) {
+          const { object, property } = callee.node;
+          if (t.isIdentifier(object) && t.isIdentifier(property)) {
+            if (!isValidFunctionCallName(`${object.name}.${property.name}`)) {
+              context.bailout("BailOnCapitalizedFunctionCalls", {
+                code: "E0018",
+                path: callee,
+                context: null,
+              });
+            }
+          }
         }
       },
     });