diff --git a/c/examples/cobyla/cobyla_example.c b/c/examples/cobyla/cobyla_example.c
index b6d08e35e5..f381abb92f 100644
--- a/c/examples/cobyla/cobyla_example.c
+++ b/c/examples/cobyla/cobyla_example.c
@@ -48,7 +48,7 @@ int main(int argc, char * argv[])
     problem.calcfc = &fun;
     // Provide the initial values of the objective function and the nonlinear constraints.
     // This is OPTIONAL, and end users should NOT do it in general. Here, we do it for testing.
-    // problme.f0 and problem.nlconstr0 are used when interfacing with Python and Julia etc.
+    // problem.f0 and problem.nlconstr0 are used when interfacing with Python and Julia etc.
     // They are not designed for C users.See the documentation of `prima_problem_t` for details.
 #if PROVIDE_INITIAL_F_AND_NLCONSTR
     double nlconstr0[M_NLCON] = {0};