diff --git a/src/drive.cpp b/src/drive.cpp
index 661f538..f816cda 100644
--- a/src/drive.cpp
+++ b/src/drive.cpp
@@ -47,13 +47,13 @@ uint32_t Drive::getPowerCycles(void)
 }
 
 string Drive::sCapacityToText() {
-    if(getCapacity() <= (999*1000000000U)) {
+    if(getCapacity() <= (999*1000000000UL)) {
         // Less or even 999 GB --> GB
-        return  to_string(getCapacity() / 1000000000U) + " GB";
+        return  to_string(getCapacity() / 1000000000UL) + " GB";
     }
     else {
         // More 999 GB --> TB
-        return  to_string(getCapacity() / 1000000000000U) + " TB";
+        return  to_string(getCapacity() / 1000000000000UL) + " TB";
     }
     return "ERROR";
 }