--- a/extern/libjpeg-turbo/CMakeLists.txt
+++ b/extern/libjpeg-turbo/CMakeLists.txt
@@ -395,7 +395,7 @@
 # COMPILER SETTINGS
 ###############################################################################

-string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_UC)
+set(CMAKE_BUILD_TYPE_UC RELEASE)

 if(MSVC_LIKE)
   option(WITH_CRT_DLL
--- a/extern/libjpeg-turbo/simd/CMakeLists.txt
+++ b/extern/libjpeg-turbo/simd/CMakeLists.txt
@@ -108,7 +108,7 @@
   endif()
 endif()

-string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_UC)
+set(CMAKE_BUILD_TYPE_UC RELEASE)
 set(EFFECTIVE_ASM_NASM_FLAGS "${CMAKE_ASM_NASM_FLAGS} ${CMAKE_ASM_NASM_FLAGS_${CMAKE_BUILD_TYPE_UC}}")
 message(STATUS "CMAKE_ASM_NASM_FLAGS = ${EFFECTIVE_ASM_NASM_FLAGS}")