diff --git a/board/ruby_mini/ruby_piggy.c b/board/ruby_mini/ruby_piggy.c
index bd93c63..c47b831 100644
--- a/board/ruby_mini/ruby_piggy.c
+++ b/board/ruby_mini/ruby_piggy.c
@@ -60,7 +60,7 @@
 	int __attribute__((unused)) rc;
 
 	unsigned long decompression_addr = RUBY_SRAM_BEGIN + TEXT_BASE_OFFSET_CHILD;
-	unsigned long uncompressed_size;
+	unsigned long uncompressed_size = RUBY_SRAM_SIZE - TEXT_BASE_OFFSET_CHILD;;
 	void (*start)(void) __attribute__((noreturn));
 
 	debug_setup();
@@ -73,6 +73,8 @@
 	/* decompress u-boot mini */
 	rc = lzmaBuffToBuffDecompress((void *) decompression_addr, &uncompressed_size,
 			payload, payload_len);
+	/* Hang if decompression failed. */
+	if (rc) for(;;) ;
 	DBGVAR(rc);
 
 	/* copy over early config bytes */