diff -r 7532963bd15b -r 80d273229f24 libidav/davqlparser.c
--- a/libidav/davqlparser.c	Tue Jun 02 21:03:58 2015 +0200
+++ b/libidav/davqlparser.c	Wed Jun 03 11:47:38 2015 +0200
@@ -515,11 +515,18 @@
         // quoted strings / identifiers are a single token
         if (src.ptr[i] == '\'' || src.ptr[i] == '`') {
             if (src.ptr[i] == insequence) {
-                // add quoted token to list
-                token->value.length++;
-                tokens = dav_parse_add_token(tokens, token);
-                token = NULL;
-                insequence = '\0';
+                // lookahead for escaped string quotes
+                if (src.ptr[i] == '\'' && i+2 < src.length &&
+                    src.ptr[i+1] == src.ptr[i] && src.ptr[i+2] == src.ptr[i]) {
+                    token->value.length += 3;
+                    i += 2;
+                } else {
+                    // add quoted token to list
+                    token->value.length++;
+                    tokens = dav_parse_add_token(tokens, token);
+                    token = NULL;
+                    insequence = '\0';
+                }
             } else if (insequence == '\0') {
                 insequence = src.ptr[i];
                 // always create new token for quoted strings