diff --git a/src/Functions/FunctionsHashing.h b/src/Functions/FunctionsHashing.h
index b4c87dd761a..21f326c0f40 100644
--- a/src/Functions/FunctionsHashing.h
+++ b/src/Functions/FunctionsHashing.h
@@ -533,7 +533,7 @@ public:
 
     DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
     {
-        if (!isString(arguments[0]))
+        if (!isStringOrFixedString(arguments[0]))
             throw Exception("Illegal type " + arguments[0]->getName() + " of argument of function " + getName(),
                 ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
 
@@ -567,6 +567,22 @@ public:
 
             block.getByPosition(result).column = std::move(col_to);
         }
+        else if (
+            const ColumnFixedString * col_from_fix = checkAndGetColumn<ColumnFixedString>(block.getByPosition(arguments[0]).column.get()))
+        {
+            auto col_to = ColumnFixedString::create(Impl::length);
+            const typename ColumnFixedString::Chars & data = col_from_fix->getChars();
+            const auto size = col_from_fix->size();
+            auto & chars_to = col_to->getChars();
+            const auto length = col_from_fix->getN();
+            chars_to.resize(size * Impl::length);
+            for (size_t i = 0; i < size; ++i)
+            {
+                Impl::apply(
+                    reinterpret_cast<const char *>(&data[i * length]), length, reinterpret_cast<uint8_t *>(&chars_to[i * Impl::length]));
+            }
+            block.getByPosition(result).column = std::move(col_to);
+        }
         else
             throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
                     + " of first argument of function " + getName(),
diff --git a/tests/queries/0_stateless/01338_sha256_fixedstring.reference b/tests/queries/0_stateless/01338_sha256_fixedstring.reference
new file mode 100644
index 00000000000..891fbcd3f9b
--- /dev/null
+++ b/tests/queries/0_stateless/01338_sha256_fixedstring.reference
@@ -0,0 +1,22 @@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 --git a/tests/queries/0_stateless/01338_sha256_fixedstring.sql b/tests/queries/0_stateless/01338_sha256_fixedstring.sql
new file mode 100644
index 00000000000..8d34e59f344
--- /dev/null
+++ b/tests/queries/0_stateless/01338_sha256_fixedstring.sql
@@ -0,0 +1,14 @@
+SELECT hex(SHA256(''));
+SELECT hex(SHA256('abc'));
+
+DROP TABLE IF EXISTS defaults;
+CREATE TABLE defaults
+(
+    s FixedString(20)
+)ENGINE = Memory();
+
+INSERT INTO defaults SELECT s FROM generateRandom('s FixedString(20)', 1, 1, 1) LIMIT 20;
+
+SELECT hex(SHA256(s)) FROM defaults;
+
+DROP TABLE defaults;