diff --git a/src/UglyToad.PdfPig.Fonts/CompactFontFormat/CharStrings/Type2CharStringParser.cs b/src/UglyToad.PdfPig.Fonts/CompactFontFormat/CharStrings/Type2CharStringParser.cs
index 6a63d94b..02accd22 100644
--- a/src/UglyToad.PdfPig.Fonts/CompactFontFormat/CharStrings/Type2CharStringParser.cs
+++ b/src/UglyToad.PdfPig.Fonts/CompactFontFormat/CharStrings/Type2CharStringParser.cs
@@ -860,8 +860,8 @@ namespace UglyToad.PdfPig.Fonts.CompactFontFormat.CharStrings
             return new Type2CharStrings.CommandSequence.CommandIdentifier(precedingValues.Count, false, 255);
         }
 
-        private static int CalculatePrecedingHintBytes(IReadOnlyList<float> precedingValues,
-            IReadOnlyList<Type2CharStrings.CommandSequence.CommandIdentifier> precedingCommands)
+        private static int CalculatePrecedingHintBytes(List<float> precedingValues,
+    List<Type2CharStrings.CommandSequence.CommandIdentifier> precedingCommands)
         {
             int SafeStemCount(int counts)
             {
@@ -873,7 +873,7 @@ namespace UglyToad.PdfPig.Fonts.CompactFontFormat.CharStrings
 
                 return (counts - 1) / 2;
             }
-            
+
             /*
              * The hintmask operator is followed by one or more data bytes that specify the stem hints which are to be active for the
              * subsequent path construction. The number of data bytes must be exactly the number needed to represent the number of
@@ -891,8 +891,14 @@ namespace UglyToad.PdfPig.Fonts.CompactFontFormat.CharStrings
                     precedingNumbers++;
                 }
 
-                foreach (var identifier in precedingCommands.Where(x => x.CommandIndex == i + 1))
+                for (var j = 0; j < precedingCommands.Count; j++)
                 {
+                    var identifier = precedingCommands[j];
+                    if (identifier.CommandIndex != i + 1)
+                    {
+                        continue;
+                    }
+
                     if (!identifier.IsMultiByteCommand
                         && (identifier.CommandId == HintmaskByte || identifier.CommandId == CntrmaskByte)
                         && !hasEncounteredInitialHintMask)
diff --git a/src/UglyToad.PdfPig.Tests/Parser/Parts/FileHeaderParserTests.cs b/src/UglyToad.PdfPig.Tests/Parser/Parts/FileHeaderParserTests.cs
index cc3a1cda..a292e9bd 100644
--- a/src/UglyToad.PdfPig.Tests/Parser/Parts/FileHeaderParserTests.cs
+++ b/src/UglyToad.PdfPig.Tests/Parser/Parts/FileHeaderParserTests.cs
@@ -4,6 +4,7 @@
     using Logging;
     using PdfPig.Core;
     using PdfPig.Parser.FileStructure;
+    using PdfPig.Tokenization.Scanner;
     using Xunit;
 
     public class FileHeaderParserTests
@@ -137,5 +138,17 @@ three %PDF-1.6");
             Assert.Equal(0, scanner.CurrentPosition);
             Assert.Equal(0, result.OffsetInFile);
         }
+
+        [Fact]
+        public void Issue334()
+        {
+            var input = OtherEncodings.StringAsLatin1Bytes("%PDF-1.7\r\n%âãÏÓ\r\n1 0 obj\r\n<</Lang(en-US)>>\r\nendobj");
+
+            var scanner = new CoreTokenScanner(new ByteArrayInputBytes(input), ScannerScope.None);
+
+            var result = FileHeaderParser.Parse(scanner, false, log);
+
+            Assert.Equal(1.7m, result.Version);
+        }
     }
 }