diff --git a/BaseTools/Conf/tools_def.template b/BaseTools/Conf/tools_def.template
index cd6eb8124a..a848bfef70 100755
--- a/BaseTools/Conf/tools_def.template
+++ b/BaseTools/Conf/tools_def.template
@@ -190,9 +190,6 @@ DEFINE CYGWIN_BINX64           = c:/cygwin/opt/tiano/x86_64-pc-mingw64/x86_64-pc
 DEFINE GCC44_IA32_PREFIX       = ENV(GCC44_BIN)
 DEFINE GCC44_X64_PREFIX        = ENV(GCC44_BIN)
 
-DEFINE GCC45_IA32_PREFIX       = ENV(GCC45_BIN)
-DEFINE GCC45_X64_PREFIX        = ENV(GCC45_BIN)
-
 DEFINE GCC48_IA32_PREFIX       = ENV(GCC48_BIN)
 DEFINE GCC48_X64_PREFIX        = ENV(GCC48_BIN)
 
@@ -4162,23 +4159,14 @@ DEFINE GCC44_X64_DLINK_FLAGS         = DEF(GCC44_IA32_X64_DLINK_FLAGS) -Wl,-melf
 DEFINE GCC44_X64_DLINK2_FLAGS        = -Wl,--defsym=PECOFF_HEADER_SIZE=0x228 DEF(GCC_DLINK2_FLAGS_COMMON)
 DEFINE GCC44_ASM_FLAGS               = DEF(GCC_ASM_FLAGS)
 
-DEFINE GCC45_IA32_CC_FLAGS           = DEF(GCC44_IA32_CC_FLAGS)
-DEFINE GCC45_X64_CC_FLAGS            = DEF(GCC44_X64_CC_FLAGS)
-DEFINE GCC45_IA32_X64_ASLDLINK_FLAGS = DEF(GCC44_IA32_X64_ASLDLINK_FLAGS)
-DEFINE GCC45_IA32_X64_DLINK_FLAGS    = DEF(GCC44_IA32_X64_DLINK_FLAGS)
-DEFINE GCC45_IA32_DLINK2_FLAGS       = DEF(GCC44_IA32_DLINK2_FLAGS)
-DEFINE GCC45_X64_DLINK_FLAGS         = DEF(GCC44_X64_DLINK_FLAGS)
-DEFINE GCC45_X64_DLINK2_FLAGS        = DEF(GCC44_X64_DLINK2_FLAGS)
-DEFINE GCC45_ASM_FLAGS               = DEF(GCC44_ASM_FLAGS)
-
-DEFINE GCC48_IA32_CC_FLAGS           = DEF(GCC45_IA32_CC_FLAGS) -Wno-address
-DEFINE GCC48_X64_CC_FLAGS            = DEF(GCC45_X64_CC_FLAGS) -Wno-address
-DEFINE GCC48_IA32_X64_ASLDLINK_FLAGS = DEF(GCC45_IA32_X64_ASLDLINK_FLAGS)
-DEFINE GCC48_IA32_X64_DLINK_FLAGS    = DEF(GCC45_IA32_X64_DLINK_FLAGS)
-DEFINE GCC48_IA32_DLINK2_FLAGS       = DEF(GCC45_IA32_DLINK2_FLAGS)
-DEFINE GCC48_X64_DLINK_FLAGS         = DEF(GCC45_X64_DLINK_FLAGS)
-DEFINE GCC48_X64_DLINK2_FLAGS        = DEF(GCC45_X64_DLINK2_FLAGS)
-DEFINE GCC48_ASM_FLAGS               = DEF(GCC45_ASM_FLAGS)
+DEFINE GCC48_IA32_CC_FLAGS           = DEF(GCC44_IA32_CC_FLAGS) -Wno-address
+DEFINE GCC48_X64_CC_FLAGS            = DEF(GCC44_X64_CC_FLAGS) -Wno-address
+DEFINE GCC48_IA32_X64_ASLDLINK_FLAGS = DEF(GCC44_IA32_X64_ASLDLINK_FLAGS)
+DEFINE GCC48_IA32_X64_DLINK_FLAGS    = DEF(GCC44_IA32_X64_DLINK_FLAGS)
+DEFINE GCC48_IA32_DLINK2_FLAGS       = DEF(GCC44_IA32_DLINK2_FLAGS)
+DEFINE GCC48_X64_DLINK_FLAGS         = DEF(GCC44_X64_DLINK_FLAGS)
+DEFINE GCC48_X64_DLINK2_FLAGS        = DEF(GCC44_X64_DLINK2_FLAGS)
+DEFINE GCC48_ASM_FLAGS               = DEF(GCC44_ASM_FLAGS)
 DEFINE GCC48_ARM_ASM_FLAGS           = $(ARCHASM_FLAGS) $(PLATFORM_FLAGS) DEF(GCC_ASM_FLAGS) -mlittle-endian
 DEFINE GCC48_AARCH64_ASM_FLAGS       = $(ARCHASM_FLAGS) $(PLATFORM_FLAGS) DEF(GCC_ASM_FLAGS) -mlittle-endian
 DEFINE GCC48_ARM_CC_FLAGS            = $(ARCHCC_FLAGS) $(PLATFORM_FLAGS) DEF(GCC_ARM_CC_FLAGS) -fstack-protector -mword-relocations