diff --git a/ports/esp32/esp32_common.cmake b/ports/esp32/esp32_common.cmake
index 4f520f408..d6a4aedb8 100644
--- a/ports/esp32/esp32_common.cmake
+++ b/ports/esp32/esp32_common.cmake
@@ -289,6 +289,7 @@ endif()
 # Add additional extmod and usermod components.
 if (MICROPY_PY_BTREE)
     target_link_libraries(${MICROPY_TARGET} $<TARGET_OBJECTS:micropy_extmod_btree>)
+    target_link_libraries(${MICROPY_TARGET} "-u abort_")  # micropy_extmod_btree links to this symbol found in MICROPY_TARGET
 endif()
 target_link_libraries(${MICROPY_TARGET} usermod)