diff --git a/mk2rbc/node.go b/mk2rbc/node.go
index 4f7c4f0..dea4dc8 100644
--- a/mk2rbc/node.go
+++ b/mk2rbc/node.go
@@ -86,6 +86,8 @@
 	path             interpolateExpr
 	candidateModules []*moduleInfo
 	loadAlways       bool
+	location         ErrorLocation
+	needsWarning     bool
 }
 
 func (i inheritedDynamicModule) name() string {
@@ -97,6 +99,10 @@
 }
 
 func (i inheritedDynamicModule) emitSelect(gctx *generationContext) {
+	if i.needsWarning {
+		gctx.newLine()
+		gctx.writef("%s.mkwarning(%q, %q)", baseName, i.location, "Including a path with a non-constant prefix, please convert this to a simple literal to generate cleaner starlark.")
+	}
 	gctx.newLine()
 	gctx.writef("_entry = {")
 	gctx.indentLevel++