diff --git a/CHANGELOG.md b/CHANGELOG.md
index a99708d4..1df052cf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Support for git submodules in package manager-aware setting (#305)
+- Deletion of files in locked environment is now suppressed (#302)
 
 ## [2.3.0] - 2023-12-06
 
diff --git a/cls/SourceControl/Git/Extension.cls b/cls/SourceControl/Git/Extension.cls
index 9e639c5c..1674fcc1 100644
--- a/cls/SourceControl/Git/Extension.cls
+++ b/cls/SourceControl/Git/Extension.cls
@@ -47,7 +47,7 @@ Method UserAction(Type As %Integer, Name As %String, InternalName As %String, Se
     if Type = 1, Name = 5 {
         // reroute to Status menu option
         set Name = "%SourceMenu,Status"
-    }
+    } 
 
     #dim ec as %Status = $$$OK
     #dim menu as %Status = $piece(Name, ",", 1)
@@ -253,13 +253,18 @@ InternalName'="" && ##class(Utils).IsInSourceControl(##class(Utils).NormalizeInt
 /// Called before an item is deleted.
 Method OnBeforeDelete(InternalName As %String) As %Status
 {
-    set context = ##class(SourceControl.Git.PackageManagerContext).ForInternalName(InternalName)
-    set InternalName = ##class(Utils).NormalizeInternalName(InternalName)
-    set Filename = ##class(Utils).FullExternalName(InternalName)
-    if ##class(Utils).IsInSourceControl(InternalName) {
-        quit ##class(Change).AddDeletedToUncommitted(Filename, InternalName)
+    if ..IsReadOnly(InternalName) {
+        // throw error if deleting readonly item
+        Throw ##class(%Exception.General).%New("Can't delete in locked environment")
+    } else {
+        set context = ##class(SourceControl.Git.PackageManagerContext).ForInternalName(InternalName)
+        set InternalName = ##class(Utils).NormalizeInternalName(InternalName)
+        set Filename = ##class(Utils).FullExternalName(InternalName)
+        if ##class(Utils).IsInSourceControl(InternalName) {
+            quit ##class(Change).AddDeletedToUncommitted(Filename, InternalName)
+        }
+        quit $$$OK
     }
-    quit $$$OK
 }
 
 /// Called after an item is deleted.
diff --git a/test/UnitTest/SourceControl/Git/AddRemove.cls b/test/UnitTest/SourceControl/Git/AddRemove.cls
index 85890573..6ae2ac16 100644
--- a/test/UnitTest/SourceControl/Git/AddRemove.cls
+++ b/test/UnitTest/SourceControl/Git/AddRemove.cls
@@ -3,6 +3,20 @@ Import SourceControl.Git
 Class UnitTest.SourceControl.Git.AddRemove Extends %UnitTest.TestCase
 {
 
+Method TestReadonlyDelete()
+{
+	new %SourceControl
+	do ##class(%Studio.SourceControl.Interface).SourceControlCreate()
+	do ##class(API).Lock()
+	try {
+		do %SourceControl.OnBeforeDelete("")
+		do $$$AssertFailure("No error thrown when deleting in locked environment")
+	}  catch e {
+		do $$$AssertEquals(e.Name,"Can't delete in locked environment")
+	}
+    do ##class(API).Unlock()
+}
+
 Method TestInit()
 {
 	new %SourceControl