diff --git a/apps/system/rust.cmake b/apps/system/rust.cmake
index b1f738f..90c2360 100644
--- a/apps/system/rust.cmake
+++ b/apps/system/rust.cmake
@@ -21,11 +21,10 @@ set(CARGO_OPTIONS
 # lib_name: Name of library that is created
 # SOURCE_DIR: source directory of cargo project
 # BUILD_DIR: directory for cargo build output
-# TARGET: custom target to use. See in ../rust_targets/ for list of available targets.
 # LIB_FILENAME: filename of library created by cargo
 # DEPENDS: And target or file dependencies that need to be run before cargo
 function(RustAddLibrary lib_name)
-    cmake_parse_arguments(PARSE_ARGV 1 RUST "" "SOURCE_DIR;BUILD_DIR;TARGET;LIB_FILENAME" "DEPENDS")
+    cmake_parse_arguments(PARSE_ARGV 1 RUST "" "SOURCE_DIR;BUILD_DIR;LIB_FILENAME" "DEPENDS")
     if(NOT "${RUST_UNPARSED_ARGUMENTS}" STREQUAL "")
         message(FATAL_ERROR "Unknown arguments to RustAddLibrary ${RUST_UNPARSED_ARGUMENTS}")
     endif()
@@ -38,9 +37,6 @@ function(RustAddLibrary lib_name)
     if("${RUST_BUILD_DIR}" STREQUAL "")
         set(RUST_BUILD_DIR ${CMAKE_CURRENT_BINARY_DIR})
     endif()
-    if("${RUST_TARGET}" STREQUAL "")
-        set(RUST_TARGET "riscv32imac-unknown-none-elf")
-    endif()
 
     if("${RELEASE}")
         set(CARGO_RELEASE "--release")
diff --git a/easy-settings.cmake b/easy-settings.cmake
index ff50b38..4f2fa80 100644
--- a/easy-settings.cmake
+++ b/easy-settings.cmake
@@ -3,6 +3,7 @@ set(CAMKES_APP "system" CACHE STRING "The one and only CAmkES application in thi
 set(CAPDL_LOADER_APP "kata-os-rootserver" CACHE STRING "")
 
 set(PLATFORM "sparrow" CACHE STRING "The one and only seL4 platform for Sparrow")
+set(RUST_TARGET "riscv32imac-unknown-none-elf" CACHE STRING "Rust target_arch")
 set(KernelSel4Arch "riscv32" CACHE STRING "Specifies 32-bit branch of the seL4 spike platform")
 set(KernelIsMCS ON CACHE BOOL "Enable seL4 MCS support")
 set(KernelPrinting ON CACHE BOOL "Enable seL4 console output support")