Fix up many-reader mutex typedef

This previously worked on some compilers, but not others.

1 files changed, 2 insertions, 2 deletions

diff --git a/perl.h b/perl.h
index e1b6b18196..fa0eb07b20 100644
--- a/perl.h
+++ b/perl.h
@@ -3342,11 +3342,11 @@ typedef pthread_key_t	perl_key;
 #  endif
 
 /* Many readers; single writer */
-typedef struct perl_RnW1_mutex {
+typedef struct {
     perl_mutex lock;
     perl_cond  zero_readers;
     Size_t     readers_count;
-} Perl_W1Rn_mutex_t;
+} perl_RnW1_mutex_t;
 
 
 #endif /* USE_ITHREADS */