diff --git a/firmware/application/CMakeLists.txt b/firmware/application/CMakeLists.txt
index 988f5bcd0..575c50322 100644
--- a/firmware/application/CMakeLists.txt
+++ b/firmware/application/CMakeLists.txt
@@ -44,7 +44,7 @@ if(cpp20_supported)
 else()
 	set(USE_CPPOPT "-std=c++17")
 endif()
-set(USE_CPPOPT "${USE_CPPOPT} -flto -fno-rtti -fno-exceptions -Weffc++ -Wuninitialized -Wno-volatile")
+set(USE_CPPOPT "${USE_CPPOPT} -fno-rtti -fno-exceptions -Weffc++ -Wuninitialized -Wno-volatile")
 
 # Enable this if you want the linker to remove unused code and data
 set(USE_LINK_GC yes)
@@ -347,10 +347,12 @@ set(CPPSRC
 	${HACKRF_CPLD_DATA_CPP}
 	ui_external_items_menu_loader.cpp
 	view_factory_base.cpp
-
-	${EXTCPPSRC}
 )
 
+set_source_files_properties(${CPPSRC} PROPERTIES COMPILE_FLAGS -flto) # Add lto flag to the non-external sources only
+
+list (APPEND CPPSRC ${EXTCPPSRC}) # Append external sources after setting lto flag to internal ones
+
 # C sources to be compiled in ARM mode regardless of the global setting.
 # NOTE: Mixing ARM and THUMB mode enables the -mthumb-interwork compiler
 #       option that results in lower performance and larger code size.
@@ -492,7 +494,6 @@ add_custom_command(
 )
 
 add_executable(${PROJECT_NAME}.elf ${CSRC} ${CPPSRC} ${ASMSRC})
-set_source_files_properties(${EXTCPPSRC} PROPERTIES COMPILE_FLAGS -fno-lto)
 set_target_properties(${PROJECT_NAME}.elf PROPERTIES LINK_DEPENDS ${LDSCRIPT})
 add_definitions(${DEFS})
 include_directories(. ${INCDIR})