diff --git a/BaseTools/Conf/tools_def.template b/BaseTools/Conf/tools_def.template
index 974656cb38..42a3ca04b0 100755
--- a/BaseTools/Conf/tools_def.template
+++ b/BaseTools/Conf/tools_def.template
@@ -5489,7 +5489,7 @@ DEFINE CLANG38_ALL_CC_FLAGS         = DEF(GCC44_ALL_CC_FLAGS) -Wno-empty-body -f
 DEBUG_CLANG38_IA32_CC_FLAGS         = DEF(CLANG38_ALL_CC_FLAGS) -m32 -Oz -flto -march=i586 DEF(CLANG38_IA32_TARGET) -g
 RELEASE_CLANG38_IA32_CC_FLAGS       = DEF(CLANG38_ALL_CC_FLAGS) -m32 -Oz -flto -march=i586 DEF(CLANG38_IA32_TARGET)
 *_CLANG38_IA32_DLINK_FLAGS          = DEF(GCC5_IA32_X64_DLINK_FLAGS) -Wl,-Oz -Wl,-melf_i386 -Wl,--oformat=elf32-i386
-*_CLANG38_IA32_DLINK2_FLAGS         = DEF(GCC5_IA32_DLINK2_FLAGS)
+*_CLANG38_IA32_DLINK2_FLAGS         = DEF(GCC5_IA32_DLINK2_FLAGS) -O3
 *_CLANG38_IA32_RC_FLAGS             = DEF(GCC_IA32_RC_FLAGS)
 *_CLANG38_IA32_OBJCOPY_FLAGS        =
 *_CLANG38_IA32_NASM_FLAGS           = -f elf32
@@ -5518,7 +5518,7 @@ RELEASE_CLANG38_IA32_CC_FLAGS       = DEF(CLANG38_ALL_CC_FLAGS) -m32 -Oz -flto -
 DEBUG_CLANG38_X64_CC_FLAGS         = DEF(CLANG38_ALL_CC_FLAGS) -m64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie -Oz -flto DEF(CLANG38_X64_TARGET) -g
 RELEASE_CLANG38_X64_CC_FLAGS       = DEF(CLANG38_ALL_CC_FLAGS) -m64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie -Oz -flto DEF(CLANG38_X64_TARGET)
 *_CLANG38_X64_DLINK_FLAGS          = DEF(GCC5_IA32_X64_DLINK_FLAGS) -Wl,-Oz -Wl,-melf_x86_64 -Wl,--oformat=elf64-x86-64 -Wl,-pie -mcmodel=small
-*_CLANG38_X64_DLINK2_FLAGS         = DEF(GCC5_X64_DLINK2_FLAGS)
+*_CLANG38_X64_DLINK2_FLAGS         = DEF(GCC5_X64_DLINK2_FLAGS) -O3
 *_CLANG38_X64_RC_FLAGS             = DEF(GCC_X64_RC_FLAGS)
 *_CLANG38_X64_OBJCOPY_FLAGS        =
 *_CLANG38_X64_NASM_FLAGS           = -f elf64