diff --git a/src/libexim-encrypt-dlfunc.c b/src/libexim-encrypt-dlfunc.c
index 504d1dc..fd10b28 100644
--- a/src/libexim-encrypt-dlfunc.c
+++ b/src/libexim-encrypt-dlfunc.c
@@ -9,10 +9,22 @@
 /* Exim4 dlfunc API header */
 #include <local_scan.h>
 
+// local_scan ABI version < 3
 #if LOCAL_SCAN_ABI_VERSION_MAJOR < 3
 #define LOCAL_SCAN
 #define store_get_untainted(size) store_get(size)
 #define store_get_tainted(size) store_get(size)
+
+// local_scan ABI version == 3
+#elif LOCAL_SCAN_ABI_VERSION_MAJOR == 3
+#define DLFUNC_IMPL
+#define store_get_untainted(size) store_get(size, FALSE)
+#define store_get_tainted(size) store_get(size, TRUE)
+
+# define string_copy(s) string_copy_function(s)
+extern uschar * string_copy_function(const uschar *);
+
+// local_scan ABI version > 3
 #else
 #define DLFUNC_IMPL
 #define store_get_untainted(size) store_get(size, FALSE)