diff --git a/env/csl/stm32f042/Src/CMakeLists.txt b/env/csl/stm32f042/Src/CMakeLists.txt
index 0fa8064..1712456 100644
--- a/env/csl/stm32f042/Src/CMakeLists.txt
+++ b/env/csl/stm32f042/Src/CMakeLists.txt
@@ -29,8 +29,3 @@ target_compile_definitions(stmTimer PRIVATE ${C_DEFS})
 target_include_directories(stmTimer PUBLIC ${PERIFERALS_DIR} ${CSL_INCLUDES})
 add_library(sub::timer ALIAS stmTimer)
 
-add_library(stmSPI imp_spi.c)
-target_compile_options(stmSPI PRIVATE ${C_FLAGS})
-target_compile_definitions(stmSPI PRIVATE ${C_DEFS})
-target_include_directories(stmSPI PUBLIC ${PERIFERALS_DIR} ${CSL_INCLUDES})
-add_library(sub::imp_spi ALIAS stmSPI)
diff --git a/env/csl/stm32f042/config.cmake b/env/csl/stm32f042/config.cmake
index c680610..45ac57b 100644
--- a/env/csl/stm32f042/config.cmake
+++ b/env/csl/stm32f042/config.cmake
@@ -75,6 +75,5 @@ list(APPEND EXTRA_LIBS sub::delay)
 list(APPEND EXTRA_LIBS sub::usart)
 list(APPEND EXTRA_LIBS sub::timer)
 list(APPEND EXTRA_LIBS sub::init)
-list(APPEND EXTRA_LIBS sub::imp_spi)
 list(APPEND EXTRA_LIBS sub::spi)
 list(APPEND EXTRA_LIBS sub::pin) 
diff --git a/env/periferals/CMakeLists.txt b/env/periferals/CMakeLists.txt
index d8eef73..6a98475 100644
--- a/env/periferals/CMakeLists.txt
+++ b/env/periferals/CMakeLists.txt
@@ -1,4 +1,4 @@
-add_library(SPI spi.c)
+add_library(SPI spi.c ${CSL_DIR}/Src/imp_spi.c)
 target_compile_options(SPI PRIVATE ${C_FLAGS})
 target_compile_definitions(SPI PRIVATE ${C_DEFS})
 target_include_directories(SPI PUBLIC ${PERIFERALS_DIR} ${CSL_INCLUDES})