diff --git a/.murdock b/.murdock
index 8cc3269d946b..e845d7311575 100755
--- a/.murdock
+++ b/.murdock
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-: ${TEST_BOARDS_AVAILABLE:="nrf52dk samr21-xpro"}
+: ${TEST_BOARDS_AVAILABLE:="esp32-wroom-32 nrf52dk samr21-xpro"}
 : ${TEST_BOARDS_LLVM_COMPILE:="iotlab-m3 native nrf52dk mulle nucleo-f401re samr21-xpro slstk3402a"}
 
 export RIOT_CI_BUILD=1
diff --git a/tests/driver_hd44780/Makefile b/tests/driver_hd44780/Makefile
index 644a00d54e99..e0db2b706b2a 100644
--- a/tests/driver_hd44780/Makefile
+++ b/tests/driver_hd44780/Makefile
@@ -2,4 +2,8 @@ include ../Makefile.tests_common
 
 USEMODULE += hd44780
 
+# Fails on esp32 because the driver defines default GPIOs that are used for the
+# SPI flash interface.
+TEST_ON_CI_BLACKLIST += esp32-wroom-32
+
 include $(RIOTBASE)/Makefile.include