diff --git a/libc/src/__support/high_precision_decimal.h b/libc/src/__support/high_precision_decimal.h
index ac11649d1d168..20088d6d79791 100644
--- a/libc/src/__support/high_precision_decimal.h
+++ b/libc/src/__support/high_precision_decimal.h
@@ -350,7 +350,8 @@ class HighPrecisionDecimal {
     if (!saw_dot)
       this->decimal_point = total_digits;
 
-    if (num_cur < num_len && ((num_string[num_cur] | 32) == 'e')) {
+    if (num_cur < num_len &&
+        (num_string[num_cur] == 'e' || num_string[num_cur] == 'E')) {
       ++num_cur;
       if (isdigit(num_string[num_cur]) || num_string[num_cur] == '+' ||
           num_string[num_cur] == '-') {