--- modules/filters/mod_include.c
+++ modules/filters/mod_include.c
@@ -2995,7 +2995,7 @@
     case PARSE_ARG_PREVAL:
         *store = NULL;
 
-        while (p < ep && apr_isspace(*p)) {
+        while (p < ep && (*p == ' ' || *p == '\t' || *p == '\v')) {
             ++p;
         }
 
@@ -3007,7 +3007,7 @@
                 intern->quote = *p++;
                 break;
             default:
-                intern->quote = '\0';
+                if  (*p < ' ') intern->quote = *p++; else intern->quote = '\0';
                 break;
             }