diff --git a/src/bin/psql/win32.mak b/src/bin/psql/win32.mak
index 0ebc3e512c34b6c34b5630301c858a592681eac9..0b0228f3f62b8e9c1273d07b21ea8dc892b0cfe6 100644
--- a/src/bin/psql/win32.mak
+++ b/src/bin/psql/win32.mak
@@ -28,7 +28,7 @@ CLEAN :
 
 CPP_PROJ=/nologo /ML /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D\
  "_MBCS" /Fp"$(INTDIR)\psql.pch" /YX /Fo"$(INTDIR)\\" /Fd"$(INTDIR)\\" /FD /c \
- /I ..\..\include /I ..\..\interfaces\libpq /D "HAVE_STRDUP" /D "BLCKSZ=8192"
+ /I ..\..\include /I ..\..\interfaces\libpq /D "HAVE_STRDUP"
 
 !IFDEF        MULTIBYTE
 !IFNDEF MBFLAGS
diff --git a/src/interfaces/libpq/win32.h b/src/interfaces/libpq/win32.h
index 303fbd91ca643521b28feb06e541d5f09507d4a7..6988bcd98fe599c66153a2c3280ea681c78edaa7 100644
--- a/src/interfaces/libpq/win32.h
+++ b/src/interfaces/libpq/win32.h
@@ -27,6 +27,5 @@
  */
 
 #define DEF_PGPORT "5432"
-#define BLCKSZ 8192
 #define MAXIMUM_ALIGNOF 4