diff --git a/codeCore/src/prog8/code/target/c64/C64Zeropage.kt b/codeCore/src/prog8/code/target/c64/C64Zeropage.kt
index 7fdf9adb9..8b5f2a7cd 100644
--- a/codeCore/src/prog8/code/target/c64/C64Zeropage.kt
+++ b/codeCore/src/prog8/code/target/c64/C64Zeropage.kt
@@ -44,7 +44,7 @@ class C64Zeropage(options: CompilationOptions) : Zeropage(options) {
             if (options.zeropage == ZeropageType.FLOATSAFE) {
                 // remove the zeropage locations used for floating point operations from the free list
                 free.removeAll(listOf(
-                        0x03, 0x04, 0x10, 0x11, 0x12,
+                        0x03, 0x04, 0x05, 0x06, 0x10, 0x11, 0x12,
                         0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a,
                         0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60,
                         0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,