diff --git a/dynso.c b/dynso.c
index 6d4dcf6..0822d4f 100644
--- a/dynso.c
+++ b/dynso.c
@@ -395,6 +395,7 @@ enum dynso_err dynso_add_sym_ex(struct dynso_lib* f, const char* name,
 
 			memcpy(nsym, f->syms, sizeof(struct dynso_sym)*f->nsyms);
 			f->syms = nsym;
+			f->alloc_syms = true;
 		}
 	}