diff --git a/yara-x/src/compiler/mod.rs b/yara-x/src/compiler/mod.rs
index 94803acf2..d9c512ff3 100644
--- a/yara-x/src/compiler/mod.rs
+++ b/yara-x/src/compiler/mod.rs
@@ -1094,12 +1094,12 @@ impl<'a> Compiler<'a> {
                     ),
                 );
             } else {
-                if matches!(leading.is_greedy(), Some(true)) {
+                if matches!(p.hir.is_greedy(), Some(true)) {
                     flags.set(SubPatternFlags::Greedy);
                 }
 
                 prev_sub_pattern_id = self.process_regexp(
-                    leading,
+                    &p.hir,
                     SubPattern::RegexpChainTail {
                         chained_to: prev_sub_pattern_id,
                         gap: p.gap.clone(),
diff --git a/yara-x/src/tests/mod.rs b/yara-x/src/tests/mod.rs
index 526791f47..c5e483971 100644
--- a/yara-x/src/tests/mod.rs
+++ b/yara-x/src/tests/mod.rs
@@ -438,6 +438,12 @@ fn hex_patterns() {
     pattern_true!(r#"{ 01 02 03 04 }"#, b"\x01\x02\x03\x04");
     pattern_true!(r#"{ (01 02 03 04 | 05 06 07 08) }"#, b"\x01\x02\x03\x04");
     pattern_match!(r#"{ 31 32 [-] 38 39 }"#, b"123456789", b"123456789");
+    pattern_match!(
+        r#"{ 31 ?? 33 [-]  37 ?? 39 }"#,
+        b"123456789",
+        b"123456789"
+    );
+
     pattern_match!(
         r#"{ 31 32 [-] 33 34 [-] 38 39 }"#,
         b"123456789",