diff --git a/asminc/stdio.inc b/asminc/stdio.inc
index feb061d70..6eb458b62 100644
--- a/asminc/stdio.inc
+++ b/asminc/stdio.inc
@@ -45,6 +45,8 @@ EOF             = -1
 FILENAME_MAX    = 64+1
 .elseif .defined(__ATARI__)
 FILENAME_MAX    = 63+1
+.elseif .defined(__CBM__)
+FILENAME_MAX    = 256+1
 .elseif .defined(__LUNIX__)
 FILENAME_MAX    = 80+1
 .elseif .defined(__TELESTRAT__)
diff --git a/include/limits.h b/include/limits.h
index 8dbc83ff2..532f5104a 100644
--- a/include/limits.h
+++ b/include/limits.h
@@ -68,6 +68,8 @@
 #  define PATH_MAX      (64+1)
 #elif defined(__ATARI__)
 #  define PATH_MAX      (63+1)
+#elif defined(__CBM__)
+#  define PATH_MAX      (256+1)
 #elif defined(__LUNIX__)
 #  define PATH_MAX      (80+1)
 #elif defined(__TELESTRAT__)