diff --git a/Libraries/LibRegex/RegexByteCode.cpp b/Libraries/LibRegex/RegexByteCode.cpp
index 5447b4f0edf..8458cdf61b8 100644
--- a/Libraries/LibRegex/RegexByteCode.cpp
+++ b/Libraries/LibRegex/RegexByteCode.cpp
@@ -217,6 +217,12 @@ ALWAYS_INLINE ExecutionResult OpCode_FailForks::execute(MatchInput const& input,
     input.fail_counter += state.forks_since_last_save;
     return ExecutionResult::Failed_ExecuteLowPrioForks;
 }
+ALWAYS_INLINE ExecutionResult OpCode_PopSaved::execute(MatchInput const& input, MatchState&) const
+{
+    input.saved_positions.take_last();
+    input.saved_code_unit_positions.take_last();
+    return ExecutionResult::Failed_ExecuteLowPrioForks;
+}
 
 ALWAYS_INLINE ExecutionResult OpCode_Jump::execute(MatchInput const&, MatchState& state) const
 {
diff --git a/Libraries/LibRegex/RegexByteCode.h b/Libraries/LibRegex/RegexByteCode.h
index 5fede59fd65..b9a8cdb57b2 100644
--- a/Libraries/LibRegex/RegexByteCode.h
+++ b/Libraries/LibRegex/RegexByteCode.h
@@ -31,6 +31,7 @@ using ByteCodeValueType = u64;
     __ENUMERATE_OPCODE(ForkReplaceJump)            \
     __ENUMERATE_OPCODE(ForkReplaceStay)            \
     __ENUMERATE_OPCODE(FailForks)                  \
+    __ENUMERATE_OPCODE(PopSaved)                   \
     __ENUMERATE_OPCODE(SaveLeftCaptureGroup)       \
     __ENUMERATE_OPCODE(SaveRightCaptureGroup)      \
     __ENUMERATE_OPCODE(SaveRightNamedCaptureGroup) \
@@ -266,9 +267,15 @@ public:
         switch (type) {
         case LookAroundType::LookAhead: {
             // SAVE
+            // FORKJUMP _BODY
+            // POPSAVED
+            // LABEL _BODY
             // REGEXP BODY
             // RESTORE
             empend((ByteCodeValueType)OpCodeId::Save);
+            empend((ByteCodeValueType)OpCodeId::ForkJump);
+            empend((ByteCodeValueType)1);
+            empend((ByteCodeValueType)OpCodeId::PopSaved);
             extend(move(lookaround_body));
             empend((ByteCodeValueType)OpCodeId::Restore);
             return;
@@ -613,6 +620,14 @@ public:
     ByteString arguments_string() const override { return ByteString::empty(); }
 };
 
+class OpCode_PopSaved final : public OpCode {
+public:
+    ExecutionResult execute(MatchInput const& input, MatchState& state) const override;
+    ALWAYS_INLINE OpCodeId opcode_id() const override { return OpCodeId::PopSaved; }
+    ALWAYS_INLINE size_t size() const override { return 1; }
+    ByteString arguments_string() const override { return ByteString::empty(); }
+};
+
 class OpCode_Save final : public OpCode {
 public:
     ExecutionResult execute(MatchInput const& input, MatchState& state) const override;
diff --git a/Tests/LibRegex/Regex.cpp b/Tests/LibRegex/Regex.cpp
index 5d9e5045d3f..5da284c3b0a 100644
--- a/Tests/LibRegex/Regex.cpp
+++ b/Tests/LibRegex/Regex.cpp
@@ -738,6 +738,8 @@ TEST_CASE(ECMA262_match)
         // Optimizer bug, ignoring an enabled trailing 'invert' when comparing blocks, ladybird#3421.
         { "[^]*[^]"sv, "i"sv, true },
         { "xx|...|...."sv, "cd"sv, false },
+        // Tests nested lookahead with alternation - verifies proper save/restore stack cleanup
+        { "a(?=.(?=c)|b)b"sv, "ab"sv, true },
     };
 
     for (auto& test : tests) {