diff --git a/CMakeLists.txt b/CMakeLists.txt
index 002396451..bce4f21a9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -157,7 +157,9 @@ elseif(3DS)
 	set(M_LIBRARY m)
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-format")
 	add_definitions(-DCOLOR_16_BIT -DCOLOR_5_6_5)
-	execute_process(COMMAND ${RAW2C} ${CMAKE_SOURCE_DIR}/src/platform/3ds/font.raw)
+	if (${CMAKE_SOURCE_DIR}/src/platform/3ds/font.raw IS_NEWER_THAN ${CMAKE_BINARY_DIR}/font.c)
+		execute_process(COMMAND ${RAW2C} ${CMAKE_SOURCE_DIR}/src/platform/3ds/font.raw)
+	endif()
 	include_directories(${CMAKE_BINARY_DIR})
 	list(APPEND OS_LIB sf2d ctru)
 	file(GLOB OS_SRC ${CMAKE_SOURCE_DIR}/src/platform/3ds/*.c ${CMAKE_BINARY_DIR}/font.c)
@@ -193,7 +195,9 @@ endif()
 
 if(WII)
 	add_definitions(-U__STRICT_ANSI__)
-	execute_process(COMMAND ${RAW2C} ${CMAKE_SOURCE_DIR}/src/platform/wii/font.tpl OUTPUT_QUIET ERROR_QUIET)
+	if (${CMAKE_SOURCE_DIR}/src/platform/wii/font.tpl IS_NEWER_THAN ${CMAKE_BINARY_DIR}/font.c)
+		execute_process(COMMAND ${RAW2C} ${CMAKE_SOURCE_DIR}/src/platform/wii/font.tpl OUTPUT_QUIET ERROR_QUIET)
+	endif()
 endif()
 
 if(BUILD_RASPI)
diff --git a/src/platform/psp2/CMakeLists.txt b/src/platform/psp2/CMakeLists.txt
index ac609592e..c5b27578d 100644
--- a/src/platform/psp2/CMakeLists.txt
+++ b/src/platform/psp2/CMakeLists.txt
@@ -1,7 +1,12 @@
 file(GLOB PLATFORM_SRC ${CMAKE_SOURCE_DIR}/src/platform/psp2/*.c)
 
-execute_process(COMMAND ${OBJCOPY} -I binary -O elf32-littlearm -B arm font.png ${CMAKE_BINARY_DIR}/font.o WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/res)
-execute_process(COMMAND ${OBJCOPY} -I binary -O elf32-littlearm -B arm backdrop.png ${CMAKE_BINARY_DIR}/backdrop.o WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+if (${CMAKE_SOURCE_DIR}/res/font.png IS_NEWER_THAN ${CMAKE_BINARY_DIR}/font.o)
+	execute_process(COMMAND ${OBJCOPY} -I binary -O elf32-littlearm -B arm font.png ${CMAKE_BINARY_DIR}/font.o WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/res)
+endif()
+
+if (${CMAKE_SOURCE_DIR}/res/backdrop.png IS_NEWER_THAN ${CMAKE_BINARY_DIR}/backdrop.o)
+	execute_process(COMMAND ${OBJCOPY} -I binary -O elf32-littlearm -B arm backdrop.png ${CMAKE_BINARY_DIR}/backdrop.o WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+endif()
 
 set(PLATFORM_LIBRARY -lvita2d -lSceCtrl_stub -lSceRtc_stub -lSceGxm_stub -lSceDisplay_stub -lSceAudio_stub -lSceMotion_stub -lScePower_stub -lpng -lz -l${M_LIBRARY})