diff --git a/dln.c b/dln.c
index 77bfe91b2875b5..259433bf1ac94f 100644
--- a/dln.c
+++ b/dln.c
@@ -463,8 +463,10 @@ dln_load(const char *file)
     void *handle = dln_open(file);
 
 #ifdef RUBY_DLN_CHECK_ABI
-    unsigned long long (*abi_version_fct)(void) = (unsigned long long(*)(void))dln_sym(handle, "ruby_abi_version");
-    unsigned long long binary_abi_version = (*abi_version_fct)();
+    typedef unsigned long long abi_version_number;
+    typedef abi_version_number abi_version_func(void);
+    abi_version_func *abi_version_fct = (abi_version_func *)dln_sym(handle, "ruby_abi_version");
+    abi_version_number binary_abi_version = (*abi_version_fct)();
     if (binary_abi_version != ruby_abi_version() && abi_check_enabled_p()) {
         dln_loaderror("incompatible ABI version of binary - %s", file);
     }