diff --git a/cmd/testsharder/main.go b/cmd/testsharder/main.go
index c715cdb..adbec03 100644
--- a/cmd/testsharder/main.go
+++ b/cmd/testsharder/main.go
@@ -81,10 +81,7 @@
 		if err != nil {
 			log.Fatal(err)
 		}
-		shards, err = testsharder.MultiplyShards(shards, multipliers)
-		if err != nil {
-			log.Fatal(err)
-		}
+		shards = testsharder.MultiplyShards(shards, multipliers)
 	}
 	shards = testsharder.WithMaxSize(shards, maxShardSize)
 	f := os.Stdout
diff --git a/testsharder/shard.go b/testsharder/shard.go
index b92f5ff..f5f5532 100644
--- a/testsharder/shard.go
+++ b/testsharder/shard.go
@@ -76,8 +76,7 @@
 
 // MultiplyShards appends new shards to shards where each new shard contains one test
 // repeated multiple times according to the specifications in multipliers.
-func MultiplyShards(shards []*Shard, multipliers []TestModifier) ([]*Shard, error) {
-	multipliersFound := make(map[TestModifier]bool)
+func MultiplyShards(shards []*Shard, multipliers []TestModifier) []*Shard {
 	for _, shard := range shards {
 		for _, multiplier := range multipliers {
 			for _, test := range shard.Tests {
@@ -87,15 +86,11 @@
 						Tests: multiplyTest(test, multiplier.TotalRuns),
 						Env:   shard.Env,
 					})
-					multipliersFound[multiplier] = true
 				}
 			}
 		}
 	}
-	if len(multipliersFound) != len(multipliers) {
-		return nil, fmt.Errorf("Not all of the multiplier targets were found in the test manifest. Make sure the targets appear in $root_build_dir/tests.json")
-	}
-	return shards, nil
+	return shards
 }
 
 func min(a, b int) int {
@@ -106,7 +101,7 @@
 }
 
 func divRoundUp(a, b int) int {
-	if a % b == 0 {
+	if a%b == 0 {
 		return a / b
 	}
 	return (a / b) + 1
diff --git a/testsharder/shard_test.go b/testsharder/shard_test.go
index 9c5545e..2185c5d 100644
--- a/testsharder/shard_test.go
+++ b/testsharder/shard_test.go
@@ -243,13 +243,10 @@
 			makeTestModifier(1, Fuchsia, 2),
 			makeTestModifier(3, Linux, 3),
 		}
-		actual, err := MultiplyShards(
+		actual := MultiplyShards(
 			shards,
 			multipliers,
 		)
-		if err != nil {
-			t.Fatalf("failed with errmsg: %v", err)
-		}
 		expected := append(
 			shards,
 			multShard(env1, Fuchsia, 1, 2),
@@ -258,25 +255,6 @@
 		)
 		assertEqual(t, expected, actual)
 	})
-
-	t.Run("fail to multiply shards with invalid multipliers", func(t *testing.T) {
-		shards := []*Shard{
-			shard(env1, Fuchsia, 1),
-			shard(env2, Fuchsia, 1, 2),
-			shard(env3, Linux, 3),
-		}
-		multipliers := []TestModifier{
-			makeTestModifier(1, Linux, 2),
-			makeTestModifier(3, Linux, 3),
-		}
-		_, err := MultiplyShards(
-			shards,
-			multipliers,
-		)
-		if err == nil {
-			t.Fatalf("did not fail for invalid multipliers")
-		}
-	})
 }
 
 func max(a, b int) int {