diff --git a/core/src/main/resources/lib/c/reactor-c b/core/src/main/resources/lib/c/reactor-c
index 85e56ecbcc..8986632a79 160000
--- a/core/src/main/resources/lib/c/reactor-c
+++ b/core/src/main/resources/lib/c/reactor-c
@@ -1 +1 @@
-Subproject commit 85e56ecbcc557b4b31d63e6896fa205d699472eb
+Subproject commit 8986632a796c444b3e498a7d4226f52fb2c93cb6
diff --git a/core/src/main/resources/lib/platform/zephyr/prj_lf.conf b/core/src/main/resources/lib/platform/zephyr/prj_lf.conf
index a63d1db027..5b026c5035 100644
--- a/core/src/main/resources/lib/platform/zephyr/prj_lf.conf
+++ b/core/src/main/resources/lib/platform/zephyr/prj_lf.conf
@@ -3,7 +3,6 @@
 
 # Enable printf
 CONFIG_PRINTK=y
-CONFIG_CBPRINTF_LIBC_SUBSTS=y
 # Use the newlib C library
 CONFIG_NEWLIB_LIBC=y
 CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y