diff --git a/dln.c b/dln.c
index 259433bf1a..bbed3af78c 100644
--- a/dln.c
+++ b/dln.c
@@ -465,7 +465,7 @@ dln_load(const char *file)
 #ifdef RUBY_DLN_CHECK_ABI
     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_func *abi_version_fct = (abi_version_func *)dln_sym(handle, EXTERNAL_PREFIX "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);