diff --git a/compiler/src/prog8/compiler/astprocessing/StatementReorderer.kt b/compiler/src/prog8/compiler/astprocessing/StatementReorderer.kt
index 339102cec..1cbfe2640 100644
--- a/compiler/src/prog8/compiler/astprocessing/StatementReorderer.kt
+++ b/compiler/src/prog8/compiler/astprocessing/StatementReorderer.kt
@@ -378,6 +378,11 @@ internal class StatementReorderer(val program: Program,
     }
 
     private fun replaceCallSubStatementWithGosub(function: Subroutine, call: FunctionCallStatement, parent: Node): Iterable<IAstModification> {
+        if(function.parameters.isEmpty()) {
+            // 0 params -> just GoSub
+            return listOf(IAstModification.ReplaceNode(call, GoSub(null, call.target, null, call.position), parent))
+        }
+
         val assignParams =
             function.parameters.zip(call.args).map {
                 var argumentValue = it.second
diff --git a/compilerAst/src/prog8/ast/AstToplevel.kt b/compilerAst/src/prog8/ast/AstToplevel.kt
index 4a38f89d8..94b95e7af 100644
--- a/compilerAst/src/prog8/ast/AstToplevel.kt
+++ b/compilerAst/src/prog8/ast/AstToplevel.kt
@@ -307,12 +307,10 @@ class GlobalNamespace(val modules: Iterable<Module>): Node, INameScope {
     }
 }
 
-object BuiltinFunctionScopePlaceholder : INameScope {
+internal object BuiltinFunctionScopePlaceholder : INameScope {
     override val name = "<<builtin-functions-scope-placeholder>>"
     override val position = Position("<<placeholder>>", 0, 0, 0)
     override var statements = mutableListOf<Statement>()
     override var parent: Node = ParentSentinel
     override fun linkParents(parent: Node) {}
 }
-
-
diff --git a/examples/test.p8 b/examples/test.p8
index 0c3063b36..89c78d6c7 100644
--- a/examples/test.p8
+++ b/examples/test.p8
@@ -16,7 +16,7 @@ main {
         word @shared ww
         byte @shared bb
 
-        push(-bb)
+        push(ub+1)
         pop(ub)
         txt.print_ub(ub)
         txt.nl()
@@ -25,6 +25,8 @@ main {
         txt.print_uw(uw)
         txt.nl()
 
+        single(ub+1)
+
 ;        uw=10000
 ;        routines(44,uw+123)
 ;        routines2(44,uw+123)
@@ -39,6 +41,10 @@ main {
 
     }
 
+    sub single(ubyte num) {
+        num++
+    }
+
     sub routine(uword num, ubyte a1, ubyte a2, ubyte switch, byte a3) {
         txt.print_uw(num)
         txt.spc()