diff --git a/rtl/darwin/ptypes.inc b/rtl/darwin/ptypes.inc
index 25fae08996..b0e1c10bc7 100644
--- a/rtl/darwin/ptypes.inc
+++ b/rtl/darwin/ptypes.inc
@@ -154,7 +154,7 @@ type
 
    pthread_t            = pointer;
    pthread_attr_t       = record sig: clong; opaque: array[0..36-1] of byte; end;
-   pthread_mutex_t      = record sig: clong; opaque: array[0..40-1] of byte; end;
+   pthread_mutex_t      = {$i pmutext.inc}
    pthread_mutexattr_t  = record sig: clong; opaque: array[0..8-1] of byte; end;
    pthread_cond_t       = record sig: clong; opaque: array[0..24-1] of byte; end;
    pthread_condattr_t   = record sig: clong; opaque: array[0..4-1] of byte; end;
diff --git a/rtl/freebsd/ptypes.inc b/rtl/freebsd/ptypes.inc
index c34e91fd8e..f8619c10c3 100644
--- a/rtl/freebsd/ptypes.inc
+++ b/rtl/freebsd/ptypes.inc
@@ -105,7 +105,7 @@ type
 
    pthread_t            = pointer;
    pthread_attr_t       = pointer;
-   pthread_mutex_t      = pointer;
+   pthread_mutex_t      = {$i pmutext.inc}
    pthread_mutexattr_t  = pointer;
    pthread_cond_t       = pointer;
    pthread_condattr_t   = pointer;
diff --git a/rtl/netbsd/ptypes.inc b/rtl/netbsd/ptypes.inc
index b4d32b635e..9d9b053621 100644
--- a/rtl/netbsd/ptypes.inc
+++ b/rtl/netbsd/ptypes.inc
@@ -93,7 +93,7 @@ type
 
    pthread_t            = pointer;
    pthread_attr_t       = pointer;
-   pthread_mutex_t      = pointer;
+   pthread_mutex_t      = {$ pmutext.inc}
    pthread_mutexattr_t  = pointer;
    pthread_cond_t       = pointer;
    pthread_condattr_t   = pointer;
diff --git a/rtl/openbsd/ptypes.inc b/rtl/openbsd/ptypes.inc
index 0289cc2f32..582c939845 100644
--- a/rtl/openbsd/ptypes.inc
+++ b/rtl/openbsd/ptypes.inc
@@ -93,7 +93,7 @@ type
 
    pthread_t            = pointer;
    pthread_attr_t       = pointer;
-   pthread_mutex_t      = pointer;
+   pthread_mutex_t      = {$i pmutext.inc}
    pthread_mutexattr_t  = pointer;
    pthread_cond_t       = pointer;
    pthread_condattr_t   = pointer;