diff --git a/sim/aarch64/ChangeLog b/sim/aarch64/ChangeLog
index 23736d6b842..2d13cf1eda2 100644
--- a/sim/aarch64/ChangeLog
+++ b/sim/aarch64/ChangeLog
@@ -1,3 +1,7 @@
+2021-05-01  Mike Frysinger  <vapier@gentoo.org>
+
+	* simulator.c (do_fcvtzu): Change UL to ULL.
+
 2021-04-26  Mike Frysinger  <vapier@gentoo.org>
 
 	* aclocal.m4, config.in, configure: Regenerate.
diff --git a/sim/aarch64/simulator.c b/sim/aarch64/simulator.c
index e0b428d26d9..a8391212c06 100644
--- a/sim/aarch64/simulator.c
+++ b/sim/aarch64/simulator.c
@@ -8420,7 +8420,7 @@ do_fcvtzu (sim_cpu *cpu)
 	  uint64_t value = (uint64_t) d;
 
 	  /* Do not raise an exception if we have reached ULONG_MAX.  */
-	  if (value != (1UL << 63))
+	  if (value != (1ULL << 63))
 	    RAISE_EXCEPTIONS (d, value, DOUBLE, ULONG);
 
 	  aarch64_set_reg_u64 (cpu, rd, NO_SP, value);
@@ -8431,7 +8431,7 @@ do_fcvtzu (sim_cpu *cpu)
 	  uint64_t value = (uint64_t) f;
 
 	  /* Do not raise an exception if we have reached ULONG_MAX.  */
-	  if (value != (1UL << 63))
+	  if (value != (1ULL << 63))
 	    RAISE_EXCEPTIONS (f, value, FLOAT, ULONG);
 
 	  aarch64_set_reg_u64 (cpu, rd, NO_SP, value);