diff --git a/fuzzers/strings_fuzzer.c b/fuzzers/strings_fuzzer.c
index 91b09cbaf0..510c75fd68 100644
--- a/fuzzers/strings_fuzzer.c
+++ b/fuzzers/strings_fuzzer.c
@@ -1,38 +1,40 @@
 /*
  * Copyright 2024 the Pacemaker project contributors
  *
  * The version control history for this file may have further details.
  *
  * This source code is licensed under the GNU Lesser General Public License
  * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
  */
 #include <stdint.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <strings.h>
 #include <glib.h>
 
+#include <crm/common/options.h>
+#include <crm/common/util.h>
 #include <crm/common/util_compat.h>
 #include <crm/common/strings_internal.h>
 
 int
 LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 {
   char *ns;
   guint res;
 
   if (size < 10) {
     return 0;
   }
   ns = malloc(size+1);
   memcpy(ns, data, size);
   ns[size] = '\0';
 
-  pcmk_numeric_strcasecmp(ns, ns);
+  pcmk__numeric_strcasecmp(ns, ns);
   pcmk__trim(ns);
   pcmk_parse_interval_spec(ns, &res);
   crm_get_msec(ns);
 
   free(ns);  
   return 0;
 }
diff --git a/fuzzers/utils_fuzzer.c b/fuzzers/utils_fuzzer.c
index 2bf79801c2..73c3f4e1d4 100644
--- a/fuzzers/utils_fuzzer.c
+++ b/fuzzers/utils_fuzzer.c
@@ -1,32 +1,34 @@
 /*
  * Copyright 2024 the Pacemaker project contributors
  *
  * The version control history for this file may have further details.
  *
  * This source code is licensed under the GNU Lesser General Public License
  * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
  */
 
 #include <stdint.h>
 #include <stdlib.h>
 #include <stdio.h>
 
 #include <crm/common/util.h>
 #include <crm/common/util_compat.h>
 
 int
 LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 {
   char *ns;
+  guint result;
+
   if (size < 10) {
     return 0;
   }
   ns = malloc(size+1);
   memcpy(ns, data, size);
   ns[size] = '\0';
-   
-  crm_parse_interval_spec(ns);
+
+  pcmk_parse_interval_spec(ns, &result);
 
   free(ns);  
   return 0;
 }