diff --git a/src/makeb32.env b/src/makeb32.env
index 7baadb133f..a9a4114bfa 100644
--- a/src/makeb32.env
+++ b/src/makeb32.env
@@ -42,7 +42,7 @@ DLL=0
 #
 
 !if "$(WXMAKINGDLL)" == "1"
-DLL_FLAGS= -DWXMAKINGDLL=1 # -D_WINDLL
+DLL_FLAGS= -DWXMAKINGDLL=1 -D_RTLDLL
 WXLIB= $(WXLIBDIR)\wx200.lib
 
 !else
@@ -50,7 +50,7 @@ WXLIB= $(WXLIBDIR)\wx200.lib
 LINK_FLAGS= /aa /c
 
 !if "$(WXUSINGDLL)" == "1"
-DLL_FLAGS= -DWXUSINGDLL=1
+DLL_FLAGS= -DWXUSINGDLL=1 -D_RTLDLL
 WXLIB= $(WXLIBDIR)\wx200.lib
 !else
 DLL_FLAGS=
@@ -60,7 +60,6 @@ WXLIB= $(WXLIBDIR)\wx32.lib
 !endif
 
 !if "$(WXBUILDDLL)" == "1"
-DLL_FLAGS= $(DLL_FLAGS) # -D_RTLDLL
 LINK_FLAGS= /Tpd /c $(EXTRALINKFLAGS)
 !endif