diff --git a/test/tls-provider.c b/test/tls-provider.c
index e5737dc5df..53e1d53ffa 100644
--- a/test/tls-provider.c
+++ b/test/tls-provider.c
@@ -385,6 +385,8 @@ static int tls_prov_get_capabilities(void *provctx, const char *capability,
 
     if (strcmp(capability, "TLS-GROUP") == 0) {
         /* Register our 2 groups */
+        OPENSSL_assert(xor_group.group_id >= 65024
+                       && xor_group.group_id < 65279 - NUM_DUMMY_GROUPS);
         ret = cb(xor_group_params, arg);
         ret &= cb(xor_kemgroup_params, arg);
 
@@ -396,6 +398,7 @@ static int tls_prov_get_capabilities(void *provctx, const char *capability,
 
         for (i = 0; i < NUM_DUMMY_GROUPS; i++) {
             OSSL_PARAM dummygroup[OSSL_NELEM(xor_group_params)];
+            unsigned int dummygroup_id;
 
             memcpy(dummygroup, xor_group_params, sizeof(xor_group_params));
 
@@ -411,7 +414,8 @@ static int tls_prov_get_capabilities(void *provctx, const char *capability,
             dummygroup[0].data = dummy_group_names[i];
             dummygroup[0].data_size = strlen(dummy_group_names[i]) + 1;
             /* assign unique group IDs also to dummy groups for registration */
-            *((int *)(dummygroup[3].data)) = 65279 - NUM_DUMMY_GROUPS + i;
+            dummygroup_id = 65279 - NUM_DUMMY_GROUPS + i;
+            dummygroup[3].data = (unsigned char*)&dummygroup_id;
             ret &= cb(dummygroup, arg);
         }
     }