diff --git a/frame/1m/packm/bli_packm_threading.c b/frame/1m/packm/bli_packm_threading.c
index 37010cbcf..7c026a413 100644
--- a/frame/1m/packm/bli_packm_threading.c
+++ b/frame/1m/packm/bli_packm_threading.c
@@ -36,7 +36,7 @@
 
 void bli_packm_thrinfo_free( packm_thrinfo_t* thread )
 {
-    if( thread != NULL )
+    if( thread != NULL && thread != &BLIS_PACKM_SINGLE_THREADED)
         bli_free(thread);
 }