diff --git a/include/sltdl/sltdl.h b/include/sltdl/sltdl.h
index c178dea..2b9d399 100644
--- a/include/sltdl/sltdl.h
+++ b/include/sltdl/sltdl.h
@@ -41,6 +41,7 @@ lt_api lt_dlhandle  lt_dlopenadvise(const char *, struct lt_modctl *);
 
 lt_api void *       lt_dlsym(lt_dlhandle, const char *);
 lt_api int          lt_dlclose(lt_dlhandle);
+lt_api const char * lt_dlerror(void);
 
 #ifdef __cplusplus
 }