diff --git a/cpu/fe310/Kconfig b/cpu/fe310/Kconfig
index d1be703e52..805a6d6572 100644
--- a/cpu/fe310/Kconfig
+++ b/cpu/fe310/Kconfig
@@ -9,6 +9,7 @@ config CPU_ARCH_RISCV
     bool
     select HAS_ARCH_RISCV
     select HAS_PICOLIBC if '$(RIOT_CI_BUILD)' != '1'
+    select MODULE_MALLOC_THREAD_SAFE if TEST_KCONFIG
 
 config CPU_CORE_RV32M
     bool
diff --git a/cpu/fe310/Makefile.dep b/cpu/fe310/Makefile.dep
index 99efb3df64..d5de24f900 100644
--- a/cpu/fe310/Makefile.dep
+++ b/cpu/fe310/Makefile.dep
@@ -15,3 +15,6 @@ FEATURES_REQUIRED += periph_plic
 ifneq (,$(filter periph_rtc,$(USEMODULE)))
   FEATURES_REQUIRED += periph_rtt
 endif
+
+# Make calls to malloc and friends thread-safe
+USEMODULE += malloc_thread_safe