diff --git a/src/openrct2-ui/CMakeLists.txt b/src/openrct2-ui/CMakeLists.txt
index 8779ba6971..2ee0bc3175 100644
--- a/src/openrct2-ui/CMakeLists.txt
+++ b/src/openrct2-ui/CMakeLists.txt
@@ -13,6 +13,7 @@ if (MSVC)
     find_package(SDL2 REQUIRED)
     find_library(SPEEX_LDFLAGS libspeexdsp)
 else ()
+    PKG_CHECK_MODULES(JANSSON REQUIRED jansson>=2.5)
     PKG_CHECK_MODULES(SDL2 REQUIRED sdl2)
     PKG_CHECK_MODULES(SPEEX REQUIRED speexdsp)
 endif ()