diff --git a/crates/ide-assists/src/handlers/merge_nested_if.rs b/crates/ide-assists/src/handlers/merge_nested_if.rs
index 73cb8204f209..a997e06fb442 100644
--- a/crates/ide-assists/src/handlers/merge_nested_if.rs
+++ b/crates/ide-assists/src/handlers/merge_nested_if.rs
@@ -1,7 +1,7 @@
 use ide_db::syntax_helpers::node_ext::is_pattern_cond;
 use syntax::{
     T,
-    ast::{self, AstNode, BinaryOp},
+    ast::{self, AstNode, BinaryOp, edit::AstNodeEdit},
 };
 
 use crate::{
@@ -67,7 +67,6 @@ pub(crate) fn merge_nested_if(acc: &mut Assists, ctx: &AssistContext<'_>) -> Opt
     }
 
     let nested_if_then_branch = nested_if_to_merge.then_branch()?;
-    let then_branch_range = then_branch.syntax().text_range();
 
     acc.add(AssistId::refactor_rewrite("merge_nested_if"), "Merge nested if", if_range, |edit| {
         let cond_text = if has_logic_op_or(&cond) {
@@ -85,7 +84,7 @@ pub(crate) fn merge_nested_if(acc: &mut Assists, ctx: &AssistContext<'_>) -> Opt
         let replace_cond = format!("{cond_text} && {nested_if_cond_text}");
 
         edit.replace(cond_range, replace_cond);
-        edit.replace(then_branch_range, nested_if_then_branch.syntax().text());
+        edit.replace_ast(then_branch, nested_if_then_branch.dedent(1.into()));
     })
 }
 
@@ -112,8 +111,20 @@ mod tests {
     fn merge_nested_if_test1() {
         check_assist(
             merge_nested_if,
-            "fn f() { i$0f x == 3 { if y == 4 { 1 } } }",
-            "fn f() { if x == 3 && y == 4 { 1 } }",
+            "
+            fn f() {
+                i$0f x == 3 {
+                    if y == 4 {
+                        1
+                    }
+                }
+            }",
+            "
+            fn f() {
+                if x == 3 && y == 4 {
+                    1
+                }
+            }",
         )
     }