diff --git a/lib/decompress_bunzip2.c b/lib/decompress_bunzip2.c
index 708e2a86d87b..d3dc9f2beb27 100644
--- a/lib/decompress_bunzip2.c
+++ b/lib/decompress_bunzip2.c
@@ -45,9 +45,11 @@
 */
 
 
-#ifndef STATIC
+#ifdef STATIC
+#define PREBOOT
+#else
 #include <linux/decompress/bunzip2.h>
-#endif /* !STATIC */
+#endif /* STATIC */
 
 #include <linux/decompress/mm.h>
 #include <linux/slab.h>
@@ -681,9 +683,7 @@ STATIC int INIT bunzip2(unsigned char *buf, int len,
 	set_error_fn(error_fn);
 	if (flush)
 		outbuf = malloc(BZIP2_IOBUF_SIZE);
-	else
-		len -= 4; /* Uncompressed size hack active in pre-boot
-			     environment */
+
 	if (!outbuf) {
 		error("Could not allocate output bufer");
 		return -1;
@@ -733,4 +733,14 @@ STATIC int INIT bunzip2(unsigned char *buf, int len,
 	return i;
 }
 
-#define decompress bunzip2
+#ifdef PREBOOT
+STATIC int INIT decompress(unsigned char *buf, int len,
+			int(*fill)(void*, unsigned int),
+			int(*flush)(void*, unsigned int),
+			unsigned char *outbuf,
+			int *pos,
+			void(*error_fn)(char *x))
+{
+	return bunzip2(buf, len - 4, fill, flush, outbuf, pos, error_fn);
+}
+#endif
diff --git a/lib/decompress_unlzma.c b/lib/decompress_unlzma.c
index 32123a1340e6..d3f9468e49dc 100644
--- a/lib/decompress_unlzma.c
+++ b/lib/decompress_unlzma.c
@@ -29,7 +29,9 @@
  *Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
-#ifndef STATIC
+#ifdef STATIC
+#define PREBOOT
+#else
 #include <linux/decompress/unlzma.h>
 #endif /* STATIC */
 
@@ -543,9 +545,7 @@ STATIC inline int INIT unlzma(unsigned char *buf, int in_len,
 	int ret = -1;
 
 	set_error_fn(error_fn);
-	if (!flush)
-		in_len -= 4; /* Uncompressed size hack active in pre-boot
-				environment */
+
 	if (buf)
 		inbuf = buf;
 	else
@@ -645,4 +645,15 @@ STATIC inline int INIT unlzma(unsigned char *buf, int in_len,
 	return ret;
 }
 
-#define decompress unlzma
+#ifdef PREBOOT
+STATIC int INIT decompress(unsigned char *buf, int in_len,
+			      int(*fill)(void*, unsigned int),
+			      int(*flush)(void*, unsigned int),
+			      unsigned char *output,
+			      int *posp,
+			      void(*error_fn)(char *x)
+	)
+{
+	return unlzma(buf, in_len - 4, fill, flush, output, posp, error_fn);
+}
+#endif