diff --git a/internal/lsp/source/completion/completion.go b/internal/lsp/source/completion/completion.go
index 9ebdc1c137..4689b76d00 100644
--- a/internal/lsp/source/completion/completion.go
+++ b/internal/lsp/source/completion/completion.go
@@ -1264,6 +1264,11 @@ func (c *completer) lexical(ctx context.Context) error {
 	var (
 		builtinIota = types.Universe.Lookup("iota")
 		builtinNil  = types.Universe.Lookup("nil")
+		// comparable is an interface that exists on the dev.typeparams Go branch.
+		// Filter it out from completion results to stabilize tests.
+		// TODO(rFindley) update (or remove) our handling for comparable once the
+		//                type parameter API has stabilized.
+		builtinComparable = types.Universe.Lookup("comparable")
 	)
 
 	// Track seen variables to avoid showing completions for shadowed variables.
@@ -1282,6 +1287,9 @@ func (c *completer) lexical(ctx context.Context) error {
 			if declScope != scope {
 				continue // Name was declared in some enclosing scope, or not at all.
 			}
+			if obj == builtinComparable {
+				continue
+			}
 
 			// If obj's type is invalid, find the AST node that defines the lexical block
 			// containing the declaration of obj. Don't resolve types for packages.