diff --git a/rrd.c b/rrd.c
index 526f094..d70f775 100644
--- a/rrd.c
+++ b/rrd.c
@@ -12,7 +12,11 @@
 #endif
 
 #include "php.h"
-#include "ext/standard/php_smart_string.h"
+#if PHP_VERSION_ID < 70200
+#include <ext/standard/php_smart_string.h>
+#else
+#include <Zend/zend_smart_string.h>
+#endif
 #include "ext/standard/php_array.h"
 #include "ext/standard/info.h"
 
diff --git a/rrd_graph.c b/rrd_graph.c
index 96a47f4..47477a7 100644
--- a/rrd_graph.c
+++ b/rrd_graph.c
@@ -14,7 +14,11 @@
 
 #include "php.h"
 #include "zend_exceptions.h"
-#include "ext/standard/php_smart_string.h"
+#if PHP_VERSION_ID < 70200
+#include <ext/standard/php_smart_string.h>
+#else
+#include <Zend/zend_smart_string.h>
+#endif
 
 #include <rrd.h>
 
diff --git a/rrd_update.c b/rrd_update.c
index 1fc4573..30d6501 100644
--- a/rrd_update.c
+++ b/rrd_update.c
@@ -14,7 +14,11 @@
 
 #include "php.h"
 #include "zend_exceptions.h"
-#include "ext/standard/php_smart_string.h"
+#if PHP_VERSION_ID < 70200
+#include <ext/standard/php_smart_string.h>
+#else
+#include <Zend/zend_smart_string.h>
+#endif
 
 #include <rrd.h>