diff --git a/jvm/src/test/scala/io/kaitai/struct/exprlang/ExpressionsSpec.scala b/jvm/src/test/scala/io/kaitai/struct/exprlang/ExpressionsSpec.scala
index a88ddd5a4..4c8b86ccc 100644
--- a/jvm/src/test/scala/io/kaitai/struct/exprlang/ExpressionsSpec.scala
+++ b/jvm/src/test/scala/io/kaitai/struct/exprlang/ExpressionsSpec.scala
@@ -395,33 +395,33 @@ class ExpressionsSpec extends AnyFunSpec {
 
     describe("f-strings") {
       it("parses f-string with just a string") {
-        Expressions.parse("f\"abc\"") should be(InterpolatedStr(ArrayBuffer(
+        Expressions.parse("f\"abc\"") should be(InterpolatedStr(Seq(
           Str("abc")
         )))
       }
 
       it("parses f-string with just one expression") {
-        Expressions.parse("f\"{123}\"") should be(InterpolatedStr(ArrayBuffer(
+        Expressions.parse("f\"{123}\"") should be(InterpolatedStr(Seq(
           IntNum(123)
         )))
       }
 
       it("parses f-string with string + expression") {
-        Expressions.parse("f\"foo={123}\"") should be(InterpolatedStr(ArrayBuffer(
+        Expressions.parse("f\"foo={123}\"") should be(InterpolatedStr(Seq(
           Str("foo="),
           IntNum(123)
         )))
       }
 
       it("parses f-string with expression + string") {
-        Expressions.parse("f\"{123}=abc\"") should be(InterpolatedStr(ArrayBuffer(
+        Expressions.parse("f\"{123}=abc\"") should be(InterpolatedStr(Seq(
           IntNum(123),
           Str("=abc")
         )))
       }
 
       it("parses f-string with str + expression + str") {
-        Expressions.parse("f\"abc={123}=def\"") should be(InterpolatedStr(ArrayBuffer(
+        Expressions.parse("f\"abc={123}=def\"") should be(InterpolatedStr(Seq(
           Str("abc="),
           IntNum(123),
           Str("=def")
@@ -429,17 +429,17 @@ class ExpressionsSpec extends AnyFunSpec {
       }
 
       it("parses f-string string with newline in the middle") {
-        Expressions.parse("f\"abc\\ndef\"") should be(InterpolatedStr(ArrayBuffer(Str("abc\ndef"))))
+        Expressions.parse("f\"abc\\ndef\"") should be(InterpolatedStr(Seq(Str("abc\ndef"))))
       }
 
       it("parses f-string with double quote in the middle") {
-        Expressions.parse("f\"this \\\" is a quote\"") should be(InterpolatedStr(ArrayBuffer(
+        Expressions.parse("f\"this \\\" is a quote\"") should be(InterpolatedStr(Seq(
           Str("this \" is a quote")
         )))
       }
 
       it("parses f-string with string in it") {
-        Expressions.parse("f\"abc{\"def\"}ghi\"") should be(InterpolatedStr(ArrayBuffer(
+        Expressions.parse("f\"abc{\"def\"}ghi\"") should be(InterpolatedStr(Seq(
           Str("abc"),
           Str("def"),
           Str("ghi"),
@@ -447,9 +447,9 @@ class ExpressionsSpec extends AnyFunSpec {
       }
 
       it("parses f-string with f-string in it") {
-        Expressions.parse("f\"abc{f\"def\"}ghi\"") should be(InterpolatedStr(ArrayBuffer(
+        Expressions.parse("f\"abc{f\"def\"}ghi\"") should be(InterpolatedStr(Seq(
           Str("abc"),
-          InterpolatedStr(ArrayBuffer(Str("def"))),
+          InterpolatedStr(Seq(Str("def"))),
           Str("ghi"),
         )))
       }
diff --git a/shared/src/main/scala/io/kaitai/struct/exprlang/Expressions.scala b/shared/src/main/scala/io/kaitai/struct/exprlang/Expressions.scala
index 4677a3f96..c78dfe35b 100644
--- a/shared/src/main/scala/io/kaitai/struct/exprlang/Expressions.scala
+++ b/shared/src/main/scala/io/kaitai/struct/exprlang/Expressions.scala
@@ -38,7 +38,7 @@ object Expressions {
   def fstring[_: P]: P[Ast.expr.InterpolatedStr] = P("f\"" ~/ fstringElement.rep ~ "\"").map(Ast.expr.InterpolatedStr)
   def fstringElement[_: P]: P[Ast.expr] = P(
     formatExpr |
-      Lexical.fstringItem.repX(min = 1).
+      Lexical.fstringItem.repX(1).
         map(_.mkString).
         map(Ast.expr.Str)
   )