diff --git a/Zend/Optimizer/escape_analysis.c b/Zend/Optimizer/escape_analysis.c
index b7c0a5ec4466a..4bb2b58af776d 100644
--- a/Zend/Optimizer/escape_analysis.c
+++ b/Zend/Optimizer/escape_analysis.c
@@ -400,6 +400,7 @@ zend_result zend_ssa_escape_analysis(const zend_script *script, zend_op_array *o
 	}
 
 	if (zend_build_equi_escape_sets(ees, op_array, ssa) == FAILURE) {
+		free_alloca(ees, use_heap);
 		return FAILURE;
 	}