diff --git a/frontend/model/cabs_to_ail.lem b/frontend/model/cabs_to_ail.lem
index 8907f3cdf..7cf36c554 100644
--- a/frontend/model/cabs_to_ail.lem
+++ b/frontend/model/cabs_to_ail.lem
@@ -601,7 +601,8 @@ let rec is_integer_constant_expression (AnnotatedExpression () _ loc expr_ as ex
     | AilEassert _ ->
         E.return false
     | AilEoffsetof _ _ ->
-        E.fail loc (Errors.Desugar_NotYetSupported "offsetof() in `integer constant expressions'")
+        (* STD §7.19#3 *)
+        E.return true
     | AilEstr _ ->
         E.return false
 (*
@@ -833,7 +834,9 @@ let rec is_arithmetic_constant_expression is_lvalue ((AnnotatedExpression () _ l
 (*          E.return true *)
           (* TODO: is_lvalue might be wrong depending on the type of e? *)
           is_arithmetic_constant_expression is_lvalue e
-        
+    | AilEoffsetof _ _ ->
+        (* STD §7.19#3 *)
+        E.return true
     | _ ->
         E.return false
 
diff --git a/tests/cn/offsetof_int_const.c b/tests/cn/offsetof_int_const.c
new file mode 100644
index 000000000..24df04c7b
--- /dev/null
+++ b/tests/cn/offsetof_int_const.c
@@ -0,0 +1,5 @@
+typedef struct a {
+    int b;
+    int c;
+} a;
+_Static_assert(offsetof(a, c) == sizeof(int), "no gap");
diff --git a/tests/cn/offsetof_int_const.c.verify b/tests/cn/offsetof_int_const.c.verify
new file mode 100644
index 000000000..e1522bb41
--- /dev/null
+++ b/tests/cn/offsetof_int_const.c.verify
@@ -0,0 +1 @@
+return code: 0
diff --git a/tests/run-cn-exec.sh b/tests/run-cn-exec.sh
index 14ca26277..1f7319fd6 100755
--- a/tests/run-cn-exec.sh
+++ b/tests/run-cn-exec.sh
@@ -102,6 +102,7 @@ SUCCESS=$(find cn -name '*.c' \
     ! -name "int_to_ptr.c" \
     ! -name "int_to_ptr.error.c" \
     ! -name "create_rdonly.c" \
+    ! -name "offsetof_int_const.c" \
 )
 
 # Include files which cause error for proof but not testing
@@ -168,6 +169,7 @@ BUGGY="cn/division_casting.c \
        cn/int_to_ptr.c \
        cn/int_to_ptr.error.c \
        cn/create_rdonly.c \
+       cn/offsetof_int_const.c \
        "
 
 # Exclude files which cause error for proof but not testing