diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index fd8ece62..dc3b6176 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -860,7 +860,6 @@ target_compile_options(nrf-sdk PRIVATE
         $<$<CONFIG:RELEASE>: ${RELEASE_FLAGS}>
         $<$<COMPILE_LANGUAGE:CXX>: ${CXX_FLAGS}>
         $<$<COMPILE_LANGUAGE:ASM>: ${ASM_FLAGS}>
-        -O3
         )
 
 # NimBLE