diff --git a/pcsxr/configure.ac b/pcsxr/configure.ac
index 300bb18..128b4f9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -113,6 +113,9 @@ if test "x$have_xtest" = xno; then
 	AC_MSG_ERROR([unable to find xtest headers])
 fi
 
+AC_CHECK_LIB(z, uncompress2,
+[ AC_DEFINE([HAVE_UNCOMPRESS2], [1], [Define if libz supports uncompress2]) ])
+
 AM_CONDITIONAL(USE_LIBCDIO, false)
 
 AC_ARG_ENABLE(libcdio, [  --enable-libcdio        use GNU libcdio for CD-ROM support (default=no)],
diff --git a/pcsxr/libpcsxcore/cdriso.c b/pcsxr/libpcsxcore/cdriso.c
index 04e866d..fb7f28a 100644
--- a/libpcsxcore/cdriso.c
+++ b/libpcsxcore/cdriso.c
@@ -1219,6 +1219,7 @@ static int cdread_sub_mixed(FILE *f, unsigned int base, void *dest, int sector)
 	return ret;
 }
 
+#ifndef HAVE_UNCOMPRESS2
 static int uncompress2(void *out, unsigned long *out_size, void *in, unsigned long in_size)
 {
 	static z_stream z;
@@ -1249,6 +1250,7 @@ static int uncompress2(void *out, unsigned long *out_size, void *in, unsigned lo
 	*out_size -= z.avail_out;
 	return ret == 1 ? 0 : ret;
 }
+#endif
 
 static int cdread_compressed(FILE *f, unsigned int base, void *dest, int sector)
 {