diff --git a/codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt b/codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt
index 37fd86f25..dc827f1f4 100644
--- a/codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt
+++ b/codeGenCpu6502/src/prog8/codegen/cpu6502/assignment/AssignmentAsmGen.kt
@@ -740,8 +740,8 @@ internal class AssignmentAsmGen(private val program: PtProgram,
                 }
                 else -> {
                     val rightArrayIndexer = expr.right as? PtArrayIndexer
-                    if(rightArrayIndexer!=null && rightArrayIndexer.type in ByteDatatypes && left.type in ByteDatatypes) {
-                        // special optimization for  bytevalue +/- bytearr[y] :  no need to use a tempvar, just use adc array,y or sbc array,y
+                    if(asmgen.isTargetCpu(CpuType.CPU65c02) && rightArrayIndexer!=null && rightArrayIndexer.type in ByteDatatypes && left.type in ByteDatatypes) {
+                        // special optimization (available on 65c02) for  bytevalue +/- bytearr[y] :  no need to use a tempvar, just use adc array,y or sbc array,y
                         assignExpressionToRegister(left, RegisterOrPair.A, left.type==DataType.BYTE)
                         asmgen.out("  pha")
                         asmgen.assignExpressionToRegister(rightArrayIndexer.index, RegisterOrPair.Y, false)
diff --git a/gradle.properties b/gradle.properties
index 8457bfbf4..23c700e24 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -5,4 +5,4 @@ org.gradle.daemon=true
 kotlin.code.style=official
 javaVersion=11
 kotlinVersion=1.9.10
-version=9.4.1
+version=9.4.2