diff --git a/src/sound/CMakeLists.txt b/src/sound/CMakeLists.txt
index e25c39391..644deb5c3 100644
--- a/src/sound/CMakeLists.txt
+++ b/src/sound/CMakeLists.txt
@@ -173,7 +173,7 @@ if(OPL4ML)
     target_sources(snd PRIVATE midi_opl4.c midi_opl4_yrw801.c)
 endif()
     find_package(PkgConfig REQUIRED)
-    pkg_check_modules(SERIALPORT REQUIRED libserialport)
+    pkg_check_modules(LIBSERIALPORT REQUIRED libserialport)
     include_directories(${SERIALPORT_INCLUDE})
     target_link_libraries(86Box ${SERIALPORT_LIBRARIES})
 add_subdirectory(resid-fp)