diff --git a/src/StartUpDG.jl b/src/StartUpDG.jl
index 3e1db386..7d8ed700 100644
--- a/src/StartUpDG.jl
+++ b/src/StartUpDG.jl
@@ -109,5 +109,11 @@ function __init__()
   end
 end
 
-
+# Until Julia v1.9 is the minimum required version for StartUpDG.jl, we still support Requires.jl
+@static if !isdefined(Base, :get_extension)
+    @require SummationByPartsOperators="9f78cca6-572e-554e-b819-917d2f1cf240" begin
+        include("../ext/StartUpDGSummationByPartsOperatorsExt.jl")
+    end
+end 
+  
 end # module