diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3291a7090..adf408e91 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -352,6 +352,17 @@ if( ${CMAKE_SYSTEM_NAME} STREQUAL "OpenBSD" )
 endif( )
 
 check_function_exists( getmntinfo HAVE_GETMNTINFO )
+if( HAVE_GETMNTINFO )
+  check_cxx_source_compiles("
+    #include <sys/types.h>
+    #include <sys/statvfs.h>
+    int main(){
+      struct statvfs *mntbufp;
+      int flags;
+      return getmntinfo(&mntbufp, flags);
+    }"
+    GETMNTINFO_USES_STATVFS )
+endif( HAVE_GETMNTINFO )
 check_function_exists( getnameinfo HAVE_GETNAMEINFO )
 check_function_exists( getpagesize HAVE_GETPAGESIZE )
 check_function_exists( getpeereid HAVE_GETPEEREID )
diff --git a/config.h.cmake b/config.h.cmake
index 900f32bfc..668ecdbcb 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -24,7 +24,7 @@
 #undef GETADDRINFO_RETURNS_UNIX
 
 /* getmntinfo() uses struct statvfs */
-#undef GETMNTINFO_USES_STATVFS
+#cmakedefine GETMNTINFO_USES_STATVFS
 
 /* Define if you have the MIT Kerberos libraries */
 #undef GSSAPI_MIT