diff --git a/src/mess/drivers/ssem.c b/src/mess/drivers/ssem.c
index 164421d015c..7e28ffc5b99 100644
--- a/src/mess/drivers/ssem.c
+++ b/src/mess/drivers/ssem.c
@@ -540,7 +540,7 @@ QUICKLOAD_LOAD_MEMBER(ssem_state, ssem_store)
 			// Isolate and convert 4-digit decimal address
 			memcpy(token_buf, image_line, 4);
 			token_buf[4] = '\0';
-			sscanf(token_buf, "%04d", &line);
+			sscanf(token_buf, "%04u", &line);
 
 			if (!core_stricmp(image.filetype(), "snp"))
 			{