diff --git a/tests/gnrc_sock_ip/Makefile b/tests/gnrc_sock_ip/Makefile
index 20888afa0d..737b60e7fb 100644
--- a/tests/gnrc_sock_ip/Makefile
+++ b/tests/gnrc_sock_ip/Makefile
@@ -7,7 +7,7 @@ ifeq (1, $(AUX_LOCAL))
   USEMODULE += sock_aux_local
 endif
 
-ifeq (1, $(AUX_LOCAL))
+ifeq (1, $(AUX_TIMESTAMP))
   USEMODULE += sock_aux_timestamp
 endif
 
diff --git a/tests/gnrc_sock_udp/Makefile b/tests/gnrc_sock_udp/Makefile
index ac0652b55a..749135a2b4 100644
--- a/tests/gnrc_sock_udp/Makefile
+++ b/tests/gnrc_sock_udp/Makefile
@@ -7,7 +7,7 @@ ifeq (1, $(AUX_LOCAL))
   USEMODULE += sock_aux_local
 endif
 
-ifeq (1, $(AUX_LOCAL))
+ifeq (1, $(AUX_TIMESTAMP))
   USEMODULE += sock_aux_timestamp
 endif