diff --git a/Cargo.toml b/Cargo.toml
index dcbb6eb..0020378 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,7 +15,7 @@ exclude = ["/for_tests", "/.github"]
 base58 = {version = "0.2.0"}
 bitvec = {version = "1.0.1", default-features = false, features = ["alloc"]}
 blake2 = {version = "0.10.6", default-features = false}
-external-memory-tools = {version = "0.1.0", default-features = false}
+external-memory-tools = {version = "0.1.1", default-features = false}
 frame-metadata = {version = "16.0.0", default-features = false, features = ["current", "decode"]}
 hex = {version = "0.4.3", default-features = false, features = ["alloc"]}
 num-bigint = {version = "0.4.3", default-features = false}
diff --git a/src/lib.rs b/src/lib.rs
index f410bf1..65539ae 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -605,7 +605,9 @@ where
     /// Extensions are cut to ensure the call decoding never gets outside the
     /// call data.
     pub fn data_no_extensions(&self) -> B {
-        self.data.limit_length(self.extensions_start())
+        self.data
+            .limit_length(self.extensions_start())
+            .expect("checked extensions start to be within limits when generating `MarkedData`")
     }
 
     /// Start positions for call data.