diff --git a/tools/trainerproc/main.c b/tools/trainerproc/main.c
index b301ddf552..5823facaca 100644
--- a/tools/trainerproc/main.c
+++ b/tools/trainerproc/main.c
@@ -459,7 +459,7 @@ static bool match_identifier(struct Parser *p, struct Token *t)
         if (!peek_char(&p_, &c))
             break;
 
-        if (('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z') || ('0' <= c && c <= '9') || c == '_')
+        if (('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z') || ('0' <= c && c <= '9') || c == '_'|| c == '\'')
             ;
         else
             break;
@@ -493,7 +493,7 @@ static bool match_human_identifier(struct Parser *p, struct Token *t)
         if (!peek_char(&p_, &c))
             break;
 
-        if (('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z') || c == '_' || c == '-' || c == ' ')
+        if (('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z') || c == '_' || c == '-' || c == ' ' || c == '\'')
             ;
         else if (p_.offset > t->begin && ('0' <= c && c <= '9'))
             ;
@@ -573,7 +573,7 @@ static bool match_move_identifier(struct Parser *p, struct Token *t)
         if (!peek_char(&p_, &c))
             break;
 
-        if (('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z') || ('0' <= c && c <= '9') || c == '_' || c == '-' || c == ' ' || c == ',')
+        if (('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z') || ('0' <= c && c <= '9') || c == '_' || c == '-' || c == ' ' || c == ',' || c == '\'')
             ;
         else
             break;
@@ -1581,6 +1581,8 @@ static void fprint_constant(FILE *f, const char *prefix, struct String s)
                 fputc(c, f);
             else if ('a' <= c && c <= 'z')
                 fputc(c - 'a' + 'A', f);
+            else if (c == '\'')
+                ;
             else
                 fputc('_', f);
         }