diff --git a/src/clipboard/Clipboard.cpp b/src/clipboard/Clipboard.cpp
index 467c77e..28390df 100644
--- a/src/clipboard/Clipboard.cpp
+++ b/src/clipboard/Clipboard.cpp
@@ -14,7 +14,7 @@ void Clipboard::copy(const char* fmt, ...) {
     outputStr = strdup(buf);
 
     if (fork() == 0)
-        execlp("wl-copy", "wl-copy", outputStr, nullptr);
+        execlp("wl-copy", "wl-copy", outputStr, NULL);
 
     free(outputStr);
 }