diff --git a/library/x509.c b/library/x509.c
index e2bb2fd..b487b43 100644
--- a/library/x509.c
+++ b/library/x509.c
@@ -910,7 +910,7 @@
                 c = name->val.p[i];
                 // Special characters requiring escaping, RFC 4514 Section 2.4
                 if (c) {
-                    if (strchr(",=+<>;\"\\+", c) ||
+                    if (strchr(",=+<>;\"\\", c) ||
                         ((i == 0) && strchr("# ", c)) ||
                         ((i == name->val.len-1) && (c == ' '))) {
                         if (j + 1 >= sizeof(s) - 1) {
diff --git a/library/x509_create.c b/library/x509_create.c
index a666e2d..4c52611 100644
--- a/library/x509_create.c
+++ b/library/x509_create.c
@@ -197,7 +197,7 @@
                 hexpair = 1;
                 *(d++) = n;
                 c++;
-            } else if (c == end || !strchr(" ,=+<>#;\"\\+", *c)) {
+            } else if (c == end || !strchr(" ,=+<>#;\"\\", *c)) {
                 return MBEDTLS_ERR_X509_INVALID_NAME;
             }
         }