diff --git a/src/vm/wren_compiler.c b/src/vm/wren_compiler.c
index 3937d1d2..75d0136e 100644
--- a/src/vm/wren_compiler.c
+++ b/src/vm/wren_compiler.c
@@ -3417,26 +3417,25 @@ ObjFn* wrenCompile(WrenVM* vm, ObjModule* module, const char* source,
                    bool isExpression, bool printErrors)
 {
   // Skip potential UTF-8 BOM
-  size_t sourceOffset = 0;
-  if (source[0] == (char) 0xef && source[1] == (char) 0xbb && source[2] == (char) 0xbf)
+  if (strncmp(source, "\xEF\xBB\xBF", 3) == 0)
   {
-    sourceOffset = 3;
+    source += 3;
   }
 
   Parser parser;
   parser.vm = vm;
   parser.module = module;
-  parser.source = source + sourceOffset;
+  parser.source = source;
 
-  parser.tokenStart = source + sourceOffset;
-  parser.currentChar = source + sourceOffset;
+  parser.tokenStart = source;
+  parser.currentChar = source;
   parser.currentLine = 1;
   parser.numParens = 0;
 
   // Zero-init the current token. This will get copied to previous when
   // advance() is called below.
   parser.current.type = TOKEN_ERROR;
-  parser.current.start = source + sourceOffset;
+  parser.current.start = source;
   parser.current.length = 0;
   parser.current.line = 0;
   parser.current.value = UNDEFINED_VAL;