diff --git a/libs/pak/unzip.cpp b/libs/pak/unzip.cpp
index 269c76c3..8bf2e6a4 100644
--- a/libs/pak/unzip.cpp
+++ b/libs/pak/unzip.cpp
@@ -1158,8 +1158,8 @@ int z_verbose = 0;
 
 
 typedef uLong ( *check_func ) OF ( ( uLong check, const Byte * buf, uInt len ) );
-voidp zcalloc OF( ( voidp opaque, unsigned items, unsigned size ) );
-void zcfree OF( ( voidp opaque, voidp ptr ) );
+static voidp zcalloc OF( ( voidp opaque, unsigned items, unsigned size ) );
+static void  zcfree  OF( ( voidp opaque, voidp ptr ) );
 
 #define ZALLOC( strm, items, size )	\
 	( *( ( strm )->zalloc ) )( ( strm )->opaque, ( items ), ( size ) )
diff --git a/plugins/vfspk3/unzip.cpp b/plugins/vfspk3/unzip.cpp
index 7390894a..1ef15059 100644
--- a/plugins/vfspk3/unzip.cpp
+++ b/plugins/vfspk3/unzip.cpp
@@ -1177,8 +1177,8 @@ extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
 
 
 typedef uLong (*check_func) OF((uLong check, const Byte *buf, uInt len));
-voidp zcalloc OF((voidp opaque, unsigned items, unsigned size));
-void   zcfree  OF((voidp opaque, voidp ptr));
+static voidp zcalloc OF((voidp opaque, unsigned items, unsigned size));
+static void  zcfree  OF((voidp opaque, voidp ptr));
 
 #define ZALLOC(strm, items, size) \
            (*((strm)->zalloc))((strm)->opaque, (items), (size))
diff --git a/plugins/vfsqlpk3/unzip.cpp b/plugins/vfsqlpk3/unzip.cpp
index c7ff36b7..cc1f13d5 100644
--- a/plugins/vfsqlpk3/unzip.cpp
+++ b/plugins/vfsqlpk3/unzip.cpp
@@ -1178,8 +1178,8 @@ extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
 
 
 typedef uLong (*check_func) OF((uLong check, const Byte *buf, uInt len));
-voidp zcalloc OF((voidp opaque, unsigned items, unsigned size));
-void   zcfree  OF((voidp opaque, voidp ptr));
+static voidp zcalloc OF((voidp opaque, unsigned items, unsigned size));
+static void  zcfree  OF((voidp opaque, voidp ptr));
 
 #define ZALLOC(strm, items, size) \
            (*((strm)->zalloc))((strm)->opaque, (items), (size))
diff --git a/tools/quake3/common/unzip.c b/tools/quake3/common/unzip.c
index d0659b18..1d4a919b 100644
--- a/tools/quake3/common/unzip.c
+++ b/tools/quake3/common/unzip.c
@@ -1199,8 +1199,8 @@ extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
 
 
 typedef uLong (*check_func) OF((uLong check, const Byte *buf, uInt len));
-voidp zcalloc OF((voidp opaque, unsigned items, unsigned size));
-void   zcfree  OF((voidp opaque, voidp ptr));
+static voidp zcalloc OF((voidp opaque, unsigned items, unsigned size));
+static void  zcfree  OF((voidp opaque, voidp ptr));
 
 #define ZALLOC(strm, items, size) \
            (*((strm)->zalloc))((strm)->opaque, (items), (size))