diff --git a/core/src/env/srml/srml_only/impls.rs b/core/src/env/srml/srml_only/impls.rs
index 4c765b452ef..683a493967f 100644
--- a/core/src/env/srml/srml_only/impls.rs
+++ b/core/src/env/srml/srml_only/impls.rs
@@ -113,17 +113,7 @@ where
     T: EnvTypes,
 {
     fn input() -> Vec<u8> {
-        let size = unsafe { sys::ext_input_size() };
-        if size == 0 {
-            Vec::new()
-        } else {
-            let mut buffer = Vec::new();
-            buffer.resize(size as usize, 0);
-            unsafe {
-                sys::ext_input_copy(buffer.as_mut_ptr() as u32, 0, size);
-            }
-            buffer
-        }
+        read_scratch_buffer()
     }
 
     impl_getters_for_srml_env!(
diff --git a/core/src/env/srml/srml_only/sys.rs b/core/src/env/srml/srml_only/sys.rs
index e5e9be76123..af3763b0312 100644
--- a/core/src/env/srml/srml_only/sys.rs
+++ b/core/src/env/srml/srml_only/sys.rs
@@ -82,12 +82,6 @@ extern "C" {
     /// Copies the contents of the scratch buffer to `dest_ptr`.
     pub fn ext_scratch_copy(dest_ptr: u32, offset: u32, len: u32);
 
-    /// Returns the length of the input buffer.
-    pub fn ext_input_size() -> u32;
-
-    /// Copies the contents of the input buffer to `dest_ptr`.
-    pub fn ext_input_copy(dest_ptr: u32, offset: u32, len: u32);
-
     /// Immediately returns contract execution to the caller
     /// with the provided data at `data_ptr`.
     pub fn ext_return(data_ptr: u32, data_len: u32) -> !;
diff --git a/examples/lang/erc20/src/lib.rs b/examples/lang/erc20/src/lib.rs
index 0d53f0acecd..7538bf39eb4 100644
--- a/examples/lang/erc20/src/lib.rs
+++ b/examples/lang/erc20/src/lib.rs
@@ -151,7 +151,7 @@ contract! {
 mod tests {
     use super::*;
     use ink_core::env;
-    type Types = ink_types_node_runtime::NodeRuntimeTypes;
+    type Types = ink_core::env::DefaultSrmlTypes;
 
     #[test]
     fn deployment_works() {