diff --git a/src/interfaces/libpq/win32.mak b/src/interfaces/libpq/win32.mak
index eb37c72c5811264a20966e919ed199a4fd0c50b6..abe90cea134d76860b67673bc95d35ccc715fde4 100644
--- a/src/interfaces/libpq/win32.mak
+++ b/src/interfaces/libpq/win32.mak
@@ -106,6 +106,10 @@ CLEAN :
 	-@erase "$(INTDIR)\pthread-win32.obj"
 	-@erase "$(INTDIR)\snprintf.obj"
 	-@erase "$(INTDIR)\strlcpy.obj"
+	-@erase "$(INTDIR)\dirent.obj"
+	-@erase "$(INTDIR)\dirmod.obj"
+	-@erase "$(INTDIR)\pgsleep.obj"
+	-@erase "$(INTDIR)\open.obj"
 	-@erase "$(OUTDIR)\$(OUTFILENAME).lib"
 	-@erase "$(OUTDIR)\$(OUTFILENAME)dll.lib"
 	-@erase "$(OUTDIR)\libpq.res"
@@ -143,6 +147,10 @@ LIB32_OBJS= \
 	"$(INTDIR)\encnames.obj" \
 	"$(INTDIR)\snprintf.obj" \
 	"$(INTDIR)\strlcpy.obj" \
+	"$(INTDIR)\dirent.obj" \
+	"$(INTDIR)\dirmod.obj" \
+	"$(INTDIR)\pgsleep.obj" \
+	"$(INTDIR)\open.obj" \
 	"$(INTDIR)\pthread-win32.obj"
 
 
@@ -277,6 +285,26 @@ LINK32_OBJS= \
 	$(CPP_PROJ) /I"." ..\..\port\strlcpy.c
 <<
 
+"$(INTDIR)\dirent.obj" : ..\..\port\dirent.c
+	$(CPP) @<<
+	$(CPP_PROJ) /I"." ..\..\port\dirent.c
+<<
+
+"$(INTDIR)\dirmod.obj" : ..\..\port\dirmod.c
+	$(CPP) @<<
+	$(CPP_PROJ) /I"." ..\..\port\dirmod.c
+<<
+
+"$(INTDIR)\pgsleep.obj" : ..\..\port\pgsleep.c
+	$(CPP) @<<
+	$(CPP_PROJ) /I"." ..\..\port\pgsleep.c
+<<
+
+"$(INTDIR)\open.obj" : ..\..\port\open.c
+	$(CPP) @<<
+	$(CPP_PROJ) /I"." ..\..\port\open.c
+<<
+
 .c{$(CPP_OBJS)}.obj:
 	$(CPP) $(CPP_PROJ) $<