diff --git a/types/lodash/common/collection.d.ts b/types/lodash/common/collection.d.ts
index 641a4f92f7..d8ddc97197 100644
--- a/types/lodash/common/collection.d.ts
+++ b/types/lodash/common/collection.d.ts
@@ -257,7 +257,7 @@ declare module "../index" {
          * @see _.filter
          */
         filter(
-            this: LoDashImplicitWrapper<string | string[] | null | undefined>,
+            this: LoDashImplicitWrapper<string | null | undefined>,
             predicate?: StringIterator<boolean>
         ): LoDashImplicitWrapper<string[]>;
 
@@ -299,7 +299,7 @@ declare module "../index" {
          * @see _.filter
          */
         filter(
-            this: LoDashExplicitWrapper<string | string[] | null | undefined>,
+            this: LoDashExplicitWrapper<string | null | undefined>,
             predicate?: StringIterator<boolean>
         ): LoDashExplicitWrapper<string[]>;
 
diff --git a/types/lodash/lodash-tests.ts b/types/lodash/lodash-tests.ts
index 15feece064..32b7b3fba6 100644
--- a/types/lodash/lodash-tests.ts
+++ b/types/lodash/lodash-tests.ts
@@ -1766,7 +1766,7 @@ _.chain([1, 2, 3, 4]).unshift(5, 6); // $ExpectType LoDashExplicitWrapper<number
     fp.filter("", dictionary); // $ExpectType AbcObject[]
     fp.filter({ a: 42 }, dictionary); // $ExpectType AbcObject[]
     fp.filter(["a", 42], dictionary); // $ExpectType AbcObject[]
-    fp.filter(Boolean)(["a", "b"]); // $ExpectType any[]
+    fp.filter((s: string) => s === "a")(["a", "b"]); // $ExpectType string[]
 
     // Test filtering with type guard
     const a2: Array<string | number> | null | undefined = anything;
diff --git a/types/lowdb/_lodash.d.ts b/types/lowdb/_lodash.d.ts
index c332a229c6..7267aab0d9 100644
--- a/types/lowdb/_lodash.d.ts
+++ b/types/lowdb/_lodash.d.ts
@@ -459,7 +459,7 @@ declare module "./index" {
             predicate?: _.ObjectIterateeCustom<T, boolean>
         ): LoDashExplicitSyncWrapper<boolean>;
         filter(
-            this: LoDashExplicitSyncWrapper<string | string[] | null | undefined>,
+            this: LoDashExplicitSyncWrapper<string | null | undefined>,
             predicate?: _.StringIterator<boolean>
         ): LoDashExplicitSyncWrapper<string[]>;
         filter<T, S extends T>(
@@ -2055,7 +2055,7 @@ declare module "./index" {
             predicate?: _.ObjectIterateeCustom<T, boolean>
         ): LoDashExplicitAsyncWrapper<boolean>;
         filter(
-            this: LoDashExplicitAsyncWrapper<string | string[] | null | undefined>,
+            this: LoDashExplicitAsyncWrapper<string | null | undefined>,
             predicate?: _.StringIterator<boolean>
         ): LoDashExplicitAsyncWrapper<string[]>;
         filter<T, S extends T>(