diff --git a/tccgen.c b/tccgen.c
index 315a3a2d..b7d35ba7 100644
--- a/tccgen.c
+++ b/tccgen.c
@@ -3251,8 +3251,12 @@ error:
             } else if (sf && dbt == VT_BOOL) {
                 vtop->c.i = (vtop->c.ld != 0);
             } else {
-                if(sf)
-                    vtop->c.i = vtop->c.ld;
+                if(sf) {
+                    if (dbt & VT_UNSIGNED)
+                        vtop->c.i = (uint64_t)vtop->c.ld;
+                    else
+                        vtop->c.i = (int64_t)vtop->c.ld;
+                }
                 else if (sbt_bt == VT_LLONG || (PTR_SIZE == 8 && sbt == VT_PTR))
                     ;
                 else if (sbt & VT_UNSIGNED)