diff --git a/frame/support/src/storage/generator/double_map.rs b/frame/support/src/storage/generator/double_map.rs
index 7fdcac561c093..b60bb79566d51 100644
--- a/frame/support/src/storage/generator/double_map.rs
+++ b/frame/support/src/storage/generator/double_map.rs
@@ -237,7 +237,7 @@ where
 	where
 		KArg1: EncodeLike<K1>,
 	{
-		unhashed::contains_prefix(Self::storage_double_map_final_key1(k1).as_ref())
+		unhashed::contains_prefixed_key(Self::storage_double_map_final_key1(k1).as_ref())
 	}
 
 	fn iter_prefix_values<KArg1>(k1: KArg1) -> storage::PrefixIterator<V>
diff --git a/frame/support/src/storage/generator/nmap.rs b/frame/support/src/storage/generator/nmap.rs
index 7e763e22c2029..8cf1459431171 100755
--- a/frame/support/src/storage/generator/nmap.rs
+++ b/frame/support/src/storage/generator/nmap.rs
@@ -212,7 +212,7 @@ where
 	where
 		K: HasKeyPrefix<KP>,
 	{
-		unhashed::contains_prefix(&Self::storage_n_map_partial_key(partial_key))
+		unhashed::contains_prefixed_key(&Self::storage_n_map_partial_key(partial_key))
 	}
 
 	fn iter_prefix_values<KP>(partial_key: KP) -> PrefixIterator<V>
diff --git a/frame/support/src/storage/unhashed.rs b/frame/support/src/storage/unhashed.rs
index 086194d8473f8..8388c5f885c51 100644
--- a/frame/support/src/storage/unhashed.rs
+++ b/frame/support/src/storage/unhashed.rs
@@ -154,7 +154,10 @@ pub fn clear_prefix(
 	MultiRemovalResults { maybe_cursor, backend: i, unique: i, loops: i }
 }
 
-pub fn contains_prefix(prefix: &[u8]) -> bool {
+/// Returns `true` if the storage contains any key, which starts with a certain prefix,
+/// and is longer than said prefix.
+/// This means that a key which equals the prefix will not be counted.
+pub fn contains_prefixed_key(prefix: &[u8]) -> bool {
 	match sp_io::storage::next_key(prefix) {
 		Some(key) => key.starts_with(prefix),
 		None => false,