diff --git a/tests/tests-c-compiler/check-src/check-131.-gen-PER.c b/tests/tests-c-compiler/check-src/check-131.-gen-PER.c
index ed29315..0b8fcd6 100644
--- a/tests/tests-c-compiler/check-src/check-131.-gen-PER.c
+++ b/tests/tests-c-compiler/check-src/check-131.-gen-PER.c
@@ -55,5 +55,6 @@
 		|| (pd.nboff == 16 && pd.buffer == &po.tmpspace[0]));
 	assert(pd.nboff + pd.nbits == 16);
 
+	ASN_STRUCT_FREE(asn_DEF_T, t2);
 	return 0;
 }