diff --git a/rc/filetype/rust.kak b/rc/filetype/rust.kak
index 9d870959..14071511 100644
--- a/rc/filetype/rust.kak
+++ b/rc/filetype/rust.kak
@@ -102,6 +102,8 @@ define-command -hidden rust-indent-on-opening-curly-brace %[
     evaluate-commands -draft -itersel %_
         # align indent with opening paren when { is entered on a new line after the closing paren
         try %[ execute-keys -draft h <a-F> ) M <a-k> \A\(.*\)\h*\n\h*\{\z <ret> s \A|.\z <ret> 1<a-&> ]
+        # dedent standalone { after impl or fn block without any { in between
+        try %< execute-keys -draft hh <a-?> impl|fn|struct|enum|union <ret> <a-K> \{ <ret> <a-semicolon> <semicolon> ll <a-x> <a-k> ^\h*\{$ <ret> <a-lt> >
     _
 ]
 
diff --git a/test/indent/rust/on-open-paren/cmd b/test/indent/rust/on-open-paren/cmd
new file mode 100644
index 00000000..723e4fa3
--- /dev/null
+++ b/test/indent/rust/on-open-paren/cmd
@@ -0,0 +1 @@
+c{<esc>
diff --git a/test/indent/rust/on-open-paren/in b/test/indent/rust/on-open-paren/in
new file mode 100644
index 00000000..1ca71d62
--- /dev/null
+++ b/test/indent/rust/on-open-paren/in
@@ -0,0 +1,35 @@
+    fn foo<T>(x: T)
+    where
+        T: Debug
+        %( )
+
+    fn foo<T>(x: T) where T: Debug %( )
+
+    impl<T> X for T
+    where
+        T: Debug
+        %( )
+
+    impl<T> X for T where T: Debug %( )
+
+    struct X<T>
+    where
+        T: Debug
+        %( )
+
+    struct X<T> where T: Debug %( )
+
+    enum X<T>
+    where
+        T: Debug
+        %( )
+
+    enum X<T> where T: Debug %( )
+
+    union X<T>
+    where
+        T: Debug
+        %( )
+
+    union X<T> where T: Debug %( )
+
diff --git a/test/indent/rust/on-open-paren/out b/test/indent/rust/on-open-paren/out
new file mode 100644
index 00000000..de125ea7
--- /dev/null
+++ b/test/indent/rust/on-open-paren/out
@@ -0,0 +1,35 @@
+    fn foo<T>(x: T)
+    where
+        T: Debug
+    {
+
+    fn foo<T>(x: T) where T: Debug {
+
+    impl<T> X for T
+    where
+        T: Debug
+    {
+
+    impl<T> X for T where T: Debug {
+
+    struct X<T>
+    where
+        T: Debug
+    {
+
+    struct X<T> where T: Debug {
+
+    enum X<T>
+    where
+        T: Debug
+    {
+
+    enum X<T> where T: Debug {
+
+    union X<T>
+    where
+        T: Debug
+    {
+
+    union X<T> where T: Debug {
+
diff --git a/test/indent/rust/on-open-paren/rc b/test/indent/rust/on-open-paren/rc
new file mode 100644
index 00000000..64064c25
--- /dev/null
+++ b/test/indent/rust/on-open-paren/rc
@@ -0,0 +1,3 @@
+source "%val{runtime}/colors/default.kak"
+source "%val{runtime}/rc/filetype/rust.kak"
+set buffer filetype rust