diff --git a/substrait_consumer/functional/queries/ibis_expressions/string_functions_expr.py b/substrait_consumer/functional/queries/ibis_expressions/string_functions_expr.py
index 2f2e4526..4abb96b5 100644
--- a/substrait_consumer/functional/queries/ibis_expressions/string_functions_expr.py
+++ b/substrait_consumer/functional/queries/ibis_expressions/string_functions_expr.py
@@ -78,17 +78,17 @@ def rpad_expr(nation, orders):
 
 
 def ltrim_expr(nation, orders):
-    new_col = nation.n_name.lstrip("A").name("ltrim_N_NAME")
+    new_col = nation.n_name.lstrip().name("ltrim_N_NAME")
     return nation[nation.n_name, new_col]
 
 
 def rtrim_expr(nation, orders):
-    new_col = nation.n_name.rstrip("A").name("rtrim_N_NAME")
+    new_col = nation.n_name.rstrip().name("rtrim_N_NAME")
     return nation[nation.n_name, new_col]
 
 
 def trim_expr(nation, orders):
-    new_col = nation.n_name.strip("A").name("trim_N_NAME")
+    new_col = nation.n_name.strip().name("trim_N_NAME")
     return nation[nation.n_name, new_col]
 
 
diff --git a/substrait_consumer/tests/functional/extension_functions/string_snapshots/IbisProducer/ltrim-ibis_outcome.txt b/substrait_consumer/tests/functional/extension_functions/string_snapshots/IbisProducer/ltrim-ibis_outcome.txt
index e5e4720b..2ee6126c 100644
--- a/substrait_consumer/tests/functional/extension_functions/string_snapshots/IbisProducer/ltrim-ibis_outcome.txt
+++ b/substrait_consumer/tests/functional/extension_functions/string_snapshots/IbisProducer/ltrim-ibis_outcome.txt
@@ -1 +1 @@
-<class 'TypeError'>
\ No newline at end of file
+<class 'ValueError'>
\ No newline at end of file
diff --git a/substrait_consumer/tests/functional/extension_functions/string_snapshots/IbisProducer/rtrim-ibis_outcome.txt b/substrait_consumer/tests/functional/extension_functions/string_snapshots/IbisProducer/rtrim-ibis_outcome.txt
index e5e4720b..2ee6126c 100644
--- a/substrait_consumer/tests/functional/extension_functions/string_snapshots/IbisProducer/rtrim-ibis_outcome.txt
+++ b/substrait_consumer/tests/functional/extension_functions/string_snapshots/IbisProducer/rtrim-ibis_outcome.txt
@@ -1 +1 @@
-<class 'TypeError'>
\ No newline at end of file
+<class 'ValueError'>
\ No newline at end of file
diff --git a/substrait_consumer/tests/functional/extension_functions/string_snapshots/IbisProducer/trim-ibis_outcome.txt b/substrait_consumer/tests/functional/extension_functions/string_snapshots/IbisProducer/trim-ibis_outcome.txt
index e5e4720b..2ee6126c 100644
--- a/substrait_consumer/tests/functional/extension_functions/string_snapshots/IbisProducer/trim-ibis_outcome.txt
+++ b/substrait_consumer/tests/functional/extension_functions/string_snapshots/IbisProducer/trim-ibis_outcome.txt
@@ -1 +1 @@
-<class 'TypeError'>
\ No newline at end of file
+<class 'ValueError'>
\ No newline at end of file