diff --git a/icu/createmak.cfg b/icu/createmak.cfg
index 19ef708cca40..1b47c0f76570 100644
--- a/icu/createmak.cfg
+++ b/icu/createmak.cfg
@@ -33,10 +33,10 @@ CDEF1FLAGS= -D "_WINDOWS" -D "_MBCS"
 CPP_PROJ=-nologo -MD -Za -Zi -W3 -GF -O2 -Ob2 $(EXCEPTIONSWITCH) $(CPP_PROJ_INCLUDES) $(CDEFS) $(CPDBOBJ) -c
 
 [CFlags_i18n]
-CPP_PROJ=-MD -W3 -Oi -Op -GF -FD -GS -Gy -Za -Zi $(EXCEPTIONSWITCH) $(COPT) $(CPP_PROJ_INCLUDES) $(CDEFS) -Fp".\Release/i18n.pch" $(CPDBOBJ) -c
+CPP_PROJ=-MD -W3 -Oi -GF -FD -GS -Gy -Za -Zi $(EXCEPTIONSWITCH) $(COPT) $(CPP_PROJ_INCLUDES) $(CDEFS) -Fp".\Release/i18n.pch" $(CPDBOBJ) -c
 
 [CFlags_extra_uconv]
-CPP_PROJ=-MD -W3 -Op -GF -Gy $(EXCEPTIONSWITCH) $(COPT) $(CPP_PROJ_INCLUDES) $(CDEFS) -Fp".\Release/uconv.pch" $(CPDBOBJ) -c
+CPP_PROJ=-MD -W3 -GF -Gy $(EXCEPTIONSWITCH) $(COPT) $(CPP_PROJ_INCLUDES) $(CDEFS) -Fp".\Release/uconv.pch" $(CPDBOBJ) -c
 
 [CFlags_layout]
 CPP_PROJ=-Za -GF -Gy -W3 $(EXCEPTIONSWITCH) -O2 $(CPP_PROJ_INCLUDES) $(CDEFS) -D "LAYOUT_EXPORTS" -D "_WINDOWS" -D "_MBCS" -D "_USRDLL" $(CPDBOBJ) -c
@@ -45,10 +45,10 @@ CPP_PROJ=-Za -GF -Gy -W3 $(EXCEPTIONSWITCH) -O2 $(CPP_PROJ_INCLUDES) $(CDEFS) -D
 CPP_PROJ=-Za -GF -Gy -W3 $(EXCEPTIONSWITCH) -O2 $(CPP_PROJ_INCLUDES) $(CDEFS) -D "LAYOUT_EXPORTS" -D "_WINDOWS" -D "_MBCS" -D "_USRDLL" $(CPDBOBJ) -c
 
 [CFlags_layoutex]
-CPP_PROJ=-MT -W3 -Op -GF -Gy $(EXCEPTIONSWITCH) $(COPT) $(CPP_PROJ_INCLUDES) $(CDEFS) -Fp".\Release/layoutex.pch" $(CPDBOBJ) -c
+CPP_PROJ=-MT -W3 -GF -Gy $(EXCEPTIONSWITCH) $(COPT) $(CPP_PROJ_INCLUDES) $(CDEFS) -Fp".\Release/layoutex.pch" $(CPDBOBJ) -c
 
 [CFlags_stubdata]
-CPP_PROJ=-MD -W3 -Op -GF -Gy -Za $(EXCEPTIONSWITCH) $(COPT) $(CPP_PROJ_INCLUDES) $(CDEFS) -Fp".\Release/stubdata.pch" $(CPDBOBJ) -c
+CPP_PROJ=-MD -W3 -GF -Gy -Za $(EXCEPTIONSWITCH) $(COPT) $(CPP_PROJ_INCLUDES) $(CDEFS) -Fp".\Release/stubdata.pch" $(CPDBOBJ) -c
 
 [CFlags_test_cintltst]
 CPP_PROJ=-MT -Za -O2 -W3 $(EXCEPTIONSWITCH) $(CPP_PROJ_INCLUDES) $(CDEFS) $(CPDBOBJ) -c
@@ -63,7 +63,7 @@ CPP_PROJ=-nologo -MD -Za -Zi -Ox -Ob0 -W3 $(EXCEPTIONSWITCH) $(CPP_PROJ_INCLUDES
 CPP_PROJ=-nologo -MD -Za -Zi -Ox -Ob0 -W3 $(EXCEPTIONSWITCH) $(CPP_PROJ_INCLUDES) $(CDEFS) $(CPDBOBJ) -c
 
 [CFlags_tools_ctestfw]
-CPP_PROJ=-nologo -MD -O2 -Op -FD -Za -W3 $(EXCEPTIONSWITCH) $(CPP_PROJ_INCLUDES) $(CDEFS) -Fp".\Release/icutest.pch" $(CPDBOBJ) -c
+CPP_PROJ=-nologo -MD -O2 -FD -Za -W3 $(EXCEPTIONSWITCH) $(CPP_PROJ_INCLUDES) $(CDEFS) -Fp".\Release/icutest.pch" $(CPDBOBJ) -c
 
 [CFlags_tools_genbrk]
 CPP_PROJ=-nologo -MD -Za -O2 -W3 $(EXCEPTIONSWITCH) $(CPP_PROJ_INCLUDES) $(CDEFS) $(CPDBOBJ) -c
@@ -133,7 +133,7 @@ CPP_PROJ=-MD -O2 $(CTOOLSFLAGS)
 
 [CommonLinkFlags]
 PDBOUT=/pdb:"<PDBFILE>" /out:"<OUTFILE>"
-COMMONLINKFLAGS=/incremental:no /machine:I386 /nologo $(PDBOUT)
+COMMONLINKFLAGS=/incremental:no /nologo $(PDBOUT)
 COMMONLINKFLAGS_CONSOLE=$(COMMONLINKFLAGS) /subsystem:console
 COMMONLINKFLAGS_DLL=$(COMMONLINKFLAGS) /dll
 
@@ -156,7 +156,7 @@ LINK32_FLAGS=icuuc.lib icuin.lib $(COMMONLINKFLAGS_DLL) /libpath:"..\..\lib" /im
 LINK32_FLAGS=..\..\lib\icuuc.lib ..\..\lib\icule.lib $(COMMONLINKFLAGS_DLL) /implib:"$(OUTDIR)\iculx.lib"
 
 [LinkFlags_stubdata]
-LINK32_FLAGS=kernel32.lib user32.lib /nologo /dll /incremental:yes /machine:I386 $(PDBOUT) /implib:"..\..\lib\icudata.lib"
+LINK32_FLAGS=kernel32.lib user32.lib /nologo /dll /incremental:yes $(PDBOUT) /implib:"..\..\lib\icudata.lib"
 
 [LinkFlags_test_cintltst]
 LINK32_FLAGS=icuuc.lib icuin.lib icutest.lib icutu.lib $(COMMONLINKFLAGS_CONSOLE) /libpath:"..\..\..\lib\\"