diff --git a/Makefile.common b/Makefile.common
index 97b90095ae..cd86c611fb 100644
--- a/Makefile.common
+++ b/Makefile.common
@@ -839,13 +839,9 @@ ifeq ($(WANT_ZLIB),1)
           deps/zlib/inftrees.o \
           deps/zlib/trees.o \
           deps/zlib/uncompr.o \
-          deps/zlib/zutil.o \
-          deps/zlib/ioapi.o \
-          deps/zlib/unzip.o
+          deps/zlib/zutil.o
 else
 ifeq ($(HAVE_ZLIB),1)
-ZLIB_OBJS = deps/zlib/unzip.o \
-            deps/zlib/ioapi.o
 OBJ += $(ZLIB_OBJS)
 HAVE_ZLIB_DEFLATE = 1
 endif
diff --git a/griffin/griffin.c b/griffin/griffin.c
index 402e006944..853571830e 100644
--- a/griffin/griffin.c
+++ b/griffin/griffin.c
@@ -880,12 +880,6 @@ DEPENDENCIES
 #include "../deps/zlib/zutil.c"
 #endif
 
-/* Decompression support always requires the next two files */
-#if defined(WANT_ZLIB) || defined(HAVE_ZLIB)
-#include "../deps/zlib/ioapi.c"
-#include "../deps/zlib/unzip.c"
-#endif
-
 #ifdef HAVE_7ZIP
 #include "../deps/7zip/7zIn.c"
 #include "../deps/7zip/7zAlloc.c"