diff --git a/ext/standard/filestat.c b/ext/standard/filestat.c
index 4190353d7dc7c..4cb7b93745ade 100644
--- a/ext/standard/filestat.c
+++ b/ext/standard/filestat.c
@@ -63,7 +63,7 @@
 # endif
 #endif
 
-#if HAVE_GRP_H
+#ifdef HAVE_GRP_H
 # include <grp.h>
 #endif
 
diff --git a/ext/standard/link.c b/ext/standard/link.c
index 6b7c96ca7d8ce..0529006d4667c 100644
--- a/ext/standard/link.c
+++ b/ext/standard/link.c
@@ -37,7 +37,7 @@
 #include <pwd.h>
 #endif
 #endif
-#if HAVE_GRP_H
+#ifdef HAVE_GRP_H
 # include <grp.h>
 #endif
 #include <errno.h>
diff --git a/ext/standard/pageinfo.c b/ext/standard/pageinfo.c
index f24659a95e048..c1cbc59bfaa19 100644
--- a/ext/standard/pageinfo.c
+++ b/ext/standard/pageinfo.c
@@ -27,7 +27,7 @@
 #include <pwd.h>
 #endif
 #endif
-#if HAVE_GRP_H
+#ifdef HAVE_GRP_H
 # include <grp.h>
 #endif
 #ifdef PHP_WIN32
diff --git a/win32/build/config.w32.h.in b/win32/build/config.w32.h.in
index e2b38e8c7c15a..d8fab6b07c1bd 100644
--- a/win32/build/config.w32.h.in
+++ b/win32/build/config.w32.h.in
@@ -66,7 +66,7 @@
 #define HAVE_UTIME 1
 #undef HAVE_DIRENT_H
 #define HAVE_FCNTL_H 1
-#define HAVE_GRP_H 0
+#undef HAVE_GRP_H
 #undef HAVE_PWD_H
 #undef HAVE_SYS_FILE_H
 #undef HAVE_SYS_SOCKET_H