diff --git a/tccpp.c b/tccpp.c
index 7a74232..94f0b5f 100644
--- a/tccpp.c
+++ b/tccpp.c
@@ -2557,7 +2557,6 @@ static inline void next_nomacro1(void)
     TokenSym *ts;
     uint8_t *p, *p1;
     unsigned int h;
-    int is_dec;
 
     p = file->buf_ptr;
  redo_no_start:
@@ -2752,45 +2751,23 @@ maybe_newline:
         }
         break;
 
-    case '0':
-        t = c;
-        cstr_reset(&tokcstr);
-        cstr_ccat(&tokcstr, c);
-        PEEKC(c, p);
-        is_dec = 1;
-        if ((c == 'x') || (c == 'o') || (c == 'b'))
-            is_dec = 0;
-        goto parse_num;
-
-    case '1': case '2': case '3':
+    case '0': case '1': case '2': case '3':
     case '4': case '5': case '6': case '7':
     case '8': case '9':
-        is_dec = 1;
-        t = c;
         cstr_reset(&tokcstr);
-        cstr_ccat(&tokcstr, c);
-        PEEKC(c, p);
+        /* after the first digit, accept digits, alpha, '.' or sign if
+           prefixed by 'eEpP' */
     parse_num:
         for(;;) {
-            if (parse_flags & PARSE_FLAG_ASM_FILE) {
-                if (!((isidnum_table[c - CH_EOF] & (IS_ID|IS_NUM))
-                       || (c == '.')
-                       || ((c == '+' || c == '-')
-                            && (((t == 'e' || t == 'E') && is_dec) ||
-                                ((t == 'p' || t == 'P') && !is_dec)))
-                ))
-                break;
-            } else
-                if (!((isidnum_table[c - CH_EOF] & (IS_ID|IS_NUM))
-                       || c == '.'
-                       || ((c == '+' || c == '-')
-                            && (t == 'e' || t == 'E' || t == 'p' || t == 'P')
-                )))
-                break;
-
             t = c;
             cstr_ccat(&tokcstr, c);
             PEEKC(c, p);
+            if (!((isidnum_table[c - CH_EOF] & (IS_ID|IS_NUM))
+                  || c == '.'
+                  || ((c == '+' || c == '-')
+                      && (t == 'e' || t == 'E' || t == 'p' || t == 'P')
+                      )))
+                break;
         }
         /* We add a trailing '\0' to ease parsing */
         cstr_ccat(&tokcstr, '\0');
@@ -2804,8 +2781,6 @@ maybe_newline:
         /* special dot handling because it can also start a number */
         PEEKC(c, p);
         if (isnum(c)) {
-            t = '.';
-            is_dec = 1;
             cstr_reset(&tokcstr);
             cstr_ccat(&tokcstr, '.');
             goto parse_num;