diff --git a/go/internal/gcimporter/bexport_test.go b/go/internal/gcimporter/bexport_test.go
index 116a009cfc..7300ba8929 100644
--- a/go/internal/gcimporter/bexport_test.go
+++ b/go/internal/gcimporter/bexport_test.go
@@ -200,6 +200,9 @@ func equalType(x, y types.Type) error {
 				return fmt.Errorf("mismatched %s method: %s", xm.Name(), err)
 			}
 		}
+		// Constraints are handled explicitly in the *TypeParam case below, so we
+		// don't yet need to consider embeddeds here.
+		// TODO(rfindley): consider the type set here.
 	case *types.Array:
 		y := y.(*types.Array)
 		if x.Len() != y.Len() {
@@ -315,9 +318,12 @@ func equalType(x, y types.Type) error {
 			return fmt.Errorf("unequal named types: %s vs %s", x, y)
 		}
 		// For now, just compare constraints by type string to short-circuit
-		// cycles.
-		xc := sanitizeName(x.Constraint().String())
-		yc := sanitizeName(y.Constraint().String())
+		// cycles. We have to make interfaces explicit as export data currently
+		// doesn't support marking interfaces as implicit.
+		// TODO(rfindley): remove makeExplicit once export data contains an
+		// implicit bit.
+		xc := sanitizeName(makeExplicit(x.Constraint()).String())
+		yc := sanitizeName(makeExplicit(y.Constraint()).String())
 		if xc != yc {
 			return fmt.Errorf("unequal constraints: %s vs %s", xc, yc)
 		}
@@ -328,6 +334,23 @@ func equalType(x, y types.Type) error {
 	return nil
 }
 
+// makeExplicit returns an explicit version of typ, if typ is an implicit
+// interface. Otherwise it returns typ unmodified.
+func makeExplicit(typ types.Type) types.Type {
+	if iface, _ := typ.(*types.Interface); iface != nil && typeparams.IsImplicit(iface) {
+		var methods []*types.Func
+		for i := 0; i < iface.NumExplicitMethods(); i++ {
+			methods = append(methods, iface.Method(i))
+		}
+		var embeddeds []types.Type
+		for i := 0; i < iface.NumEmbeddeds(); i++ {
+			embeddeds = append(embeddeds, iface.EmbeddedType(i))
+		}
+		return types.NewInterfaceType(methods, embeddeds)
+	}
+	return typ
+}
+
 func equalTypeArgs(x, y *typeparams.TypeList) error {
 	if x.Len() != y.Len() {
 		return fmt.Errorf("unequal lengths: %d vs %d", x.Len(), y.Len())
diff --git a/go/internal/gcimporter/iexport_go118_test.go b/go/internal/gcimporter/iexport_go118_test.go
index 50ac0f752d..b3617170ec 100644
--- a/go/internal/gcimporter/iexport_go118_test.go
+++ b/go/internal/gcimporter/iexport_go118_test.go
@@ -36,6 +36,10 @@ func ToInt[P interface{ ~int }](p P) int { return int(p) }
 var IntID = ToInt[int]
 
 type G[C comparable] int
+
+func ImplicitFunc[T ~int]() {}
+
+type ImplicitType[T ~int] int
 `
 	testExportSrc(t, []byte(src))
 }
diff --git a/internal/typeparams/typeparams_go117.go b/internal/typeparams/typeparams_go117.go
index 5a536526c5..214eab6667 100644
--- a/internal/typeparams/typeparams_go117.go
+++ b/internal/typeparams/typeparams_go117.go
@@ -132,6 +132,11 @@ func IsMethodSet(*types.Interface) bool {
 	return true
 }
 
+// IsImplicit returns false, as no interfaces are implicit at this Go version.
+func IsImplicit(*types.Interface) bool {
+	return false
+}
+
 // ForNamed returns an empty type parameter list, as type parameters are not
 // supported at this Go version.
 func ForNamed(*types.Named) *TypeParamList {
diff --git a/internal/typeparams/typeparams_go118.go b/internal/typeparams/typeparams_go118.go
index e3c48221dd..55c0398e62 100644
--- a/internal/typeparams/typeparams_go118.go
+++ b/internal/typeparams/typeparams_go118.go
@@ -125,6 +125,11 @@ func IsMethodSet(iface *types.Interface) bool {
 	return iface.IsMethodSet()
 }
 
+// IsImplicit calls iface.IsImplicit().
+func IsImplicit(iface *types.Interface) bool {
+	return iface.IsImplicit()
+}
+
 // ForNamed extracts the (possibly empty) type parameter object list from
 // named.
 func ForNamed(named *types.Named) *TypeParamList {