diff --git a/src/tree-manager/index.js b/src/tree-manager/index.js
index 65eb27bc..5c7e23f1 100644
--- a/src/tree-manager/index.js
+++ b/src/tree-manager/index.js
@@ -89,7 +89,7 @@ class TreeManager {
   }
 
   filterTree(searchTerm, keepTreeOnSearch, keepChildrenOnSearch) {
-    const matches = this.getMatches(searchTerm.toLowerCase())
+    const matches = this.getMatches(searchTerm)
 
     const matchTree = new Map()
 
@@ -289,7 +289,7 @@ class TreeManager {
   }
 
   _getAddOnMatch(matches, searchTerm) {
-    let isMatch = (node, term) => node.label.toLowerCase().indexOf(term) >= 0
+    let isMatch = (node, term) => node.label.toLowerCase().indexOf(term.toLowerCase()) >= 0
     if (typeof this.searchPredicate === 'function') {
       isMatch = this.searchPredicate
     }
diff --git a/src/tree-manager/tests/index.test.js b/src/tree-manager/tests/index.test.js
index 2b9bafea..04282054 100644
--- a/src/tree-manager/tests/index.test.js
+++ b/src/tree-manager/tests/index.test.js
@@ -484,7 +484,8 @@ test('should get matching nodes when using custom search predicate', t => {
       },
     ],
   }
-  const searchPredicate = (node, term) => node.customField && node.customField.toLowerCase().indexOf(term) >= 0
+  const searchPredicate = (node, term) =>
+    node.customField && node.customField.toLowerCase().indexOf(term.toLowerCase()) >= 0
   const manager = new TreeManager({ data: tree, searchPredicate })
   const { allNodesHidden, tree: matchTree } = manager.filterTree('tEaPoT')
   t.false(allNodesHidden)