1 files changed, 3 insertions, 4 deletions
diff --git a/core/src/fpdftext/fpdf_text.cpp b/core/src/fpdftext/fpdf_text.cpp
index bef805189b..55ab483722 100644
--- a/core/src/fpdftext/fpdf_text.cpp
+++ b/core/src/fpdftext/fpdf_text.cpp
@@ -14,8 +14,6 @@
 #include "third_party/base/nonstd_unique_ptr.h"
 #include "txtproc.h"
 
-#include <cctype>
-
 CFX_ByteString CharFromUnicodeAlt(FX_WCHAR unicode,
                                   int destcp,
                                   const FX_CHAR* defchar) {
@@ -438,9 +436,10 @@ void NormalizeString(CFX_WideString& str) {
 static FX_BOOL IsNumber(CFX_WideString& str) {
   for (int i = 0; i < str.GetLength(); i++) {
     FX_WCHAR ch = str[i];
-    // TODO(dsinclair): --.+ +.-- should probably not be a number.
-    if (!std::iswdigit(ch) && ch != '-' && ch != '+' && ch != '.' && ch != ' ')
+    if ((ch < '0' || ch > '9') && ch != '-' && ch != '+' && ch != '.' &&
+        ch != ' ') {
       return FALSE;
+    }
   }
   return TRUE;
 }