diff --git a/compile.c b/compile.c
index b73b9854f4..55a8c3a1df 100644
--- a/compile.c
+++ b/compile.c
@@ -5972,16 +5972,22 @@ compile_case3(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const orig_no
 
         l1 = NEW_LABEL(line);
         ADD_LABEL(body_seq, l1);
-        ADD_INSN(body_seq, line, pop);
-        ADD_TRACE_BRANCH_COVERAGE(
-            body_seq,
-            node->nd_body ? nd_first_lineno(node->nd_body) : lineno,
-            node->nd_body ? nd_first_column(node->nd_body) : column,
-            node->nd_body ? nd_last_lineno(node->nd_body) : last_lineno,
-            node->nd_body ? nd_last_column(node->nd_body) : last_column,
-            "in",
-            branches);
-        CHECK(COMPILE_(body_seq, "in body", node->nd_body, popped));
+        if (node->nd_body) {
+            ADD_INSN(body_seq, line, pop);
+            ADD_TRACE_BRANCH_COVERAGE(
+                body_seq,
+                nd_first_lineno(node->nd_body),
+                nd_first_column(node->nd_body),
+                nd_last_lineno(node->nd_body),
+                nd_last_column(node->nd_body),
+                "in",
+                branches);
+            CHECK(COMPILE_(body_seq, "in body", node->nd_body, popped));
+        }
+        else {
+            /* Single line pattern matching(`expr in pat`). Returns the value of expr. */
+            ADD_TRACE_BRANCH_COVERAGE(body_seq, lineno, column, last_lineno, last_column, "in", branches);
+        }
         ADD_INSNL(body_seq, line, jump, endlabel);
 
         pattern = node->nd_head;
diff --git a/parse.y b/parse.y
index 9277897f83..f76a41e4f9 100644
--- a/parse.y
+++ b/parse.y
@@ -1576,7 +1576,7 @@ expr		: command_call
 		    {
 			p->in_kwarg = !!$<num>3;
 		    /*%%%*/
-			$$ = NEW_CASE3($1, NEW_IN($5, NEW_TRUE(&@5), NEW_FALSE(&@5), &@5), &@$);
+			$$ = NEW_CASE3($1, NEW_IN($5, Qnull, Qnull, &@5), &@$);
 			rb_warn0L(nd_line($$), "Pattern matching is experimental, and the behavior may change in future versions of Ruby!");
 		    /*% %*/
 		    /*% ripper: case!($1, in!($5, Qnil, Qnil)) %*/
diff --git a/test/ruby/test_pattern_matching.rb b/test/ruby/test_pattern_matching.rb
index 889f8dd519..84b6964979 100644
--- a/test/ruby/test_pattern_matching.rb
+++ b/test/ruby/test_pattern_matching.rb
@@ -1261,7 +1261,10 @@ def test_struct
   ################################################################
 
   def test_modifier_in
-    assert_equal true, (1 in a)
+    assert_equal 1, (1 in a)
+    assert_raise(NoMatchingPatternError) do
+      1 in 2
+    end
     assert_equal 1, a
     assert_valid_syntax "p(({} in {a:}), a:\n 1)"
     assert_syntax_error(%q{