diff --git a/makefiles/makeinclude.cygnus b/makefiles/makeinclude.cygnus
index f7959abe2..3ff44feac 100644
--- a/makefiles/makeinclude.cygnus
+++ b/makefiles/makeinclude.cygnus
@@ -33,6 +33,6 @@ LIBCOMMAND      =ar -ruv
 RANLIB          =ranlib
 
 # libraries to link with:
-LDLIBS  =-lgdi32 -luser32 -lglu32 -lopengl32 -lmsvcrt -lm
+LDLIBS  =-lgdi32 -luser32 -lglu32 -lopengl32 -lmsvcrt -lwsock32 -lm
 
 INSTALL =/CYGNUS/B19/H-I386~1/BIN/install -c
diff --git a/makefiles/makeinclude.mingw32 b/makefiles/makeinclude.mingw32
index 8a24aed85..55f70f36f 100644
--- a/makefiles/makeinclude.mingw32
+++ b/makefiles/makeinclude.mingw32
@@ -26,6 +26,6 @@ LIBCOMMAND      =ar -ruv
 RANLIB          =ranlib
 
 # libraries to link with:
-LDLIBS  =-lgdi32 -luser32 -lglu32 -lopengl32 -lmsvcrt -lm -mwindows
+LDLIBS  =-lgdi32 -luser32 -lglu32 -lopengl32 -lmsvcrt -lwsock32 -lm -mwindows
 
 INSTALL =/CYGNUS/B19/H-I386~1/BIN/install -c