diff --git a/Source/p_saveg.c b/Source/p_saveg.c
index f495cadf..c9187a41 100644
--- a/Source/p_saveg.c
+++ b/Source/p_saveg.c
@@ -93,10 +93,10 @@ int64_t saveg_read64(void)
 {
     int64_t result;
 
-    result = saveg_read8();
-    result |= saveg_read8() << 8;
-    result |= saveg_read8() << 16;
-    result |= saveg_read8() << 24;
+    result =  (int64_t)(saveg_read8());
+    result |= (int64_t)(saveg_read8()) << 8;
+    result |= (int64_t)(saveg_read8()) << 16;
+    result |= (int64_t)(saveg_read8()) << 24;
     result |= (int64_t)(saveg_read8()) << 32;
     result |= (int64_t)(saveg_read8()) << 40;
     result |= (int64_t)(saveg_read8()) << 48;