diff --git a/man2/sigprocmask.2 b/man2/sigprocmask.2
index ff4d1e19b..5e0c34e51 100644
--- a/man2/sigprocmask.2
+++ b/man2/sigprocmask.2
@@ -38,7 +38,7 @@ sigprocmask, rt_sigprocmask \- examine and change blocked signals
 
 /* Prototype for the underlying system call */
 .BI "int rt_sigprocmask(int " how ", const kernel_sigset_t *" set ,
-.BI "                   kernel_sigset_t *" oldset, " size_t " sigsetsize );
+.BI "                   kernel_sigset_t *" oldset ", size_t " sigsetsize );
 
 /* Prototype for the legacy system call (deprecated) */
 .BI "int sigprocmask(int " how ", const old_kernel_sigset_t *" set ,