diff --git a/canisters/src/data/data.filter.mo b/canisters/src/data/data.filter.mo
index 509eec6c3..8bc107464 100644
--- a/canisters/src/data/data.filter.mo
+++ b/canisters/src/data/data.filter.mo
@@ -18,13 +18,13 @@ module {
         };
     };
 
-    public func contains(key: Text, contains: ?Text): Bool {
-        switch (contains) {
+    public func notContains(key: Text, notContains: ?Text): Bool {
+        switch (notContains) {
             case null {
                 return true;
             };
-            case (?contains) {
-                return Text.contains(key, #text contains);
+            case (?notContains) {
+                return not Text.contains(key, #text notContains);
             };
         };
     };
diff --git a/canisters/src/data/data.store.mo b/canisters/src/data/data.store.mo
index 850809bd8..9b67185c6 100644
--- a/canisters/src/data/data.store.mo
+++ b/canisters/src/data/data.store.mo
@@ -45,7 +45,7 @@ module {
                     let {startsWith; notContains} = filter;
 
                     let values: [(Text, T)] = Array.mapFilter<(Text, T), (Text, T)>(keyValues, func ((key: Text, value: T)) : ?(Text, T) {
-                        if (Filter.startsWith(key, startsWith) and not Filter.contains(key, notContains)) {
+                        if (Filter.startsWith(key, startsWith) and Filter.notContains(key, notContains)) {
                             return ?(key, value);
                         };