diff --git a/etc/key_mapping b/etc/key_mapping
index 31afa98b27cc8c13d771a5f14c13f613ad48bf27..0d2abbf79d213888a15c0fa7e28d24f457a9496d 100644
--- a/etc/key_mapping
+++ b/etc/key_mapping
@@ -21,6 +21,6 @@ direct_repeat                              repeat_region   rpt_type=direct
 polypeptide_domain                         misc_feature
 centromere                                 misc_feature    note=centromere
 modified_amino_acid_feature                misc_feature    note=modified_amino_acid_feature
-snRNA                                      ncRNA           ncRNA_class="snRNA"
-snoRNA                                     ncRNA           ncRNA_class="snoRNA"
+snRNA                                      ncRNA           ncRNA_class=snRNA
+snoRNA                                     ncRNA           ncRNA_class=snoRNA
 nucleotide_match                           misc_feature    note=nucleotide_match