diff --git a/boards/arm/stm32/viewtool-stm32f107/configs/tcpblaster/defconfig b/boards/arm/stm32/viewtool-stm32f107/configs/tcpblaster/defconfig
index d5c556005ce85..9e99a61ed89ee 100644
--- a/boards/arm/stm32/viewtool-stm32f107/configs/tcpblaster/defconfig
+++ b/boards/arm/stm32/viewtool-stm32f107/configs/tcpblaster/defconfig
@@ -24,6 +24,7 @@ CONFIG_INTELHEX_BINARY=y
 CONFIG_IOB_NBUFFERS=50
 CONFIG_IOB_NCHAINS=12
 CONFIG_LIBC_HOSTNAME="Viewtool-STM32F107"
+CONFIG_LIBM=y
 CONFIG_NET=y
 CONFIG_NETINIT_NOMAC=y
 CONFIG_NETINIT_THREAD=y