diff --git a/m4/tuklib_cpucores.m4 b/m4/tuklib_cpucores.m4
index a2b09a72..63063982 100644
--- a/m4/tuklib_cpucores.m4
+++ b/m4/tuklib_cpucores.m4
@@ -95,7 +95,6 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 #ifdef __QNX__
 compile error
 #endif
-#include <sys/types.h>
 #ifdef HAVE_SYS_PARAM_H
 #	include <sys/param.h>
 #endif
diff --git a/m4/tuklib_physmem.m4 b/m4/tuklib_physmem.m4
index 8a57ca29..59317859 100644
--- a/m4/tuklib_physmem.m4
+++ b/m4/tuklib_physmem.m4
@@ -88,7 +88,6 @@ main(void)
 ]])], [tuklib_cv_physmem_method=sysconf], [
 
 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
-#include <sys/types.h>
 #ifdef HAVE_SYS_PARAM_H
 #	include <sys/param.h>
 #endif