diff --git a/src/jtk/jtk.c b/src/jtk/jtk.c
index 621f15d..d44c34c 100644
--- a/src/jtk/jtk.c
+++ b/src/jtk/jtk.c
@@ -28,7 +28,7 @@ bool jtk_init()
         None,
     };
 
-    if (XInitThreads() != 0)
+    if (XInitThreads() == 0)
     {
         fprintf(stderr, "XInitThreads() failure\n");
         return false;