diff --git a/src/core/linux/SDL_threadprio.c b/src/core/linux/SDL_threadprio.c
index 162b1a3f1..2cbc4cb48 100644
--- a/src/core/linux/SDL_threadprio.c
+++ b/src/core/linux/SDL_threadprio.c
@@ -22,6 +22,7 @@
 
 #ifdef __LINUX__
 
+#include "SDL_error.h"
 #include "SDL_stdinc.h"
 
 #if !SDL_THREADS_DISABLED