diff --git a/boards/z80/z8/z8encore000zco/configs/ostest/defconfig b/boards/z80/z8/z8encore000zco/configs/ostest/defconfig
index 304c5dc08c7..126bcbf5981 100644
--- a/boards/z80/z8/z8encore000zco/configs/ostest/defconfig
+++ b/boards/z80/z8/z8encore000zco/configs/ostest/defconfig
@@ -41,4 +41,3 @@ CONFIG_UART0_TXBUFSIZE=0
 CONFIG_UART1_BAUD=57600
 CONFIG_UART1_RXBUFSIZE=0
 CONFIG_UART1_TXBUFSIZE=0
-CONFIG_Z8_ZDSII_V522=y
diff --git a/boards/z80/z8/z8f64200100kit/configs/ostest/defconfig b/boards/z80/z8/z8f64200100kit/configs/ostest/defconfig
index fd7e1d4072e..367245f8ecf 100644
--- a/boards/z80/z8/z8f64200100kit/configs/ostest/defconfig
+++ b/boards/z80/z8/z8f64200100kit/configs/ostest/defconfig
@@ -40,4 +40,3 @@ CONFIG_UART0_TXBUFSIZE=0
 CONFIG_UART1_BAUD=57600
 CONFIG_UART1_RXBUFSIZE=0
 CONFIG_UART1_TXBUFSIZE=0
-CONFIG_Z8_ZDSII_V522=y