diff --git a/dlls/dswave/dswave_main.c b/dlls/dswave/dswave_main.c
index 7fb96e6c6f1..daa37fd70da 100644
--- a/dlls/dswave/dswave_main.c
+++ b/dlls/dswave/dswave_main.c
@@ -524,7 +524,8 @@ const char *debugstr_DMUS_OBJECTDESC (LPDMUS_OBJECTDESC pDesc) {
 		if (pDesc->dwValidData & DMUS_OBJ_NAME) ptr += sprintf(ptr, " - wszName = %s\n", debugstr_w(pDesc->wszName));
 		if (pDesc->dwValidData & DMUS_OBJ_CATEGORY) ptr += sprintf(ptr, " - wszCategory = %s\n", debugstr_w(pDesc->wszCategory));
 		if (pDesc->dwValidData & DMUS_OBJ_FILENAME) ptr += sprintf(ptr, " - wszFileName = %s\n", debugstr_w(pDesc->wszFileName));
-		if (pDesc->dwValidData & DMUS_OBJ_MEMORY) ptr += sprintf(ptr, " - llMemLength = %lli\n  - pbMemData = %p\n", pDesc->llMemLength, pDesc->pbMemData);
+		if (pDesc->dwValidData & DMUS_OBJ_MEMORY) ptr += sprintf(ptr, " - llMemLength = 0x%s\n  - pbMemData = %p\n",
+		                                                     wine_dbgstr_longlong(pDesc->llMemLength), pDesc->pbMemData);
 		if (pDesc->dwValidData & DMUS_OBJ_STREAM) ptr += sprintf(ptr, " - pStream = %p", pDesc->pStream);
 
 		return wine_dbg_sprintf("%s", buffer);