diff --git a/Userland/Applications/HexEditor/HexEditor.cpp b/Userland/Applications/HexEditor/HexEditor.cpp
index 021eaac965..bc57d5b4b6 100644
--- a/Userland/Applications/HexEditor/HexEditor.cpp
+++ b/Userland/Applications/HexEditor/HexEditor.cpp
@@ -563,7 +563,7 @@ int HexEditor::find_and_highlight(ByteBuffer& needle, int start)
     if (m_buffer.is_empty())
         return -1;
 
-    auto raw_offset = memmem(m_buffer.data() + start, m_buffer.size(), needle.data(), needle.size());
+    auto raw_offset = memmem(m_buffer.data() + start, m_buffer.size() - start, needle.data(), needle.size());
     if (raw_offset == NULL)
         return -1;