diff --git a/src/Functions/randomFixedString.cpp b/src/Functions/randomFixedString.cpp
index cd19dee0bbc..70c6b013dce 100644
--- a/src/Functions/randomFixedString.cpp
+++ b/src/Functions/randomFixedString.cpp
@@ -39,7 +39,7 @@ public:
         if (!isUnsignedInteger(arguments[0].type))
             throw Exception("First argument for function " + getName() + " must be unsigned integer", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
 
-        if (!arguments[0].column)
+        if (!arguments[0].column || !isColumnConst(*arguments[0].column))
             throw Exception("First argument for function " + getName() + " must be constant", ErrorCodes::ILLEGAL_COLUMN);
 
         const size_t n = arguments[0].column->getUInt(0);
diff --git a/tests/queries/0_stateless/01277_random_fixed_string.reference b/tests/queries/0_stateless/01277_random_fixed_string.reference
new file mode 100644
index 00000000000..d00491fd7e5
--- /dev/null
+++ b/tests/queries/0_stateless/01277_random_fixed_string.reference
@@ -0,0 +1 @@
+1
diff --git a/tests/queries/0_stateless/01277_random_fixed_string.sql b/tests/queries/0_stateless/01277_random_fixed_string.sql
new file mode 100644
index 00000000000..3fb07114065
--- /dev/null
+++ b/tests/queries/0_stateless/01277_random_fixed_string.sql
@@ -0,0 +1 @@
+SELECT DISTINCT c > 30000 FROM (SELECT arrayJoin(arrayMap(x -> reinterpretAsUInt8(substring(randomFixedString(100), x + 1, 1)), range(100))) AS byte, count() AS c FROM numbers(100000) GROUP BY byte ORDER BY byte);