diff --git a/ext/compatibility.h b/ext/compatibility.h
index 01530f10987..8b80cc2995d 100644
--- a/ext/compatibility.h
+++ b/ext/compatibility.h
@@ -4,6 +4,7 @@
 #include <stdbool.h>
 #include <php.h>
 #include <Zend/zend_closures.h>
+#include <Zend/zend_smart_str.h>
 
 #include "ext/standard/base64.h"
 
@@ -110,7 +111,6 @@ static zend_always_inline zend_string *zend_string_init_interned(const char *str
 
 typedef void zend_type;
 
-#include <Zend/zend_smart_str.h>
 static inline void smart_str_append_printf(smart_str *dest, const char *format, ...) {
     va_list arg;
     va_start(arg, format);
@@ -324,6 +324,22 @@ static zend_always_inline zend_result add_next_index_object(zval *arg, zend_obje
     return zend_hash_next_index_insert(Z_ARRVAL_P(arg), &tmp) ? SUCCESS : FAILURE;
 }
 
+static zend_always_inline void smart_str_appendl(smart_str *dest, const char *src, size_t length) {
+    size_t new_len = smart_str_alloc(dest, len, false);
+    memcpy(ZSTR_VAL(dest->s) + ZSTR_LEN(dest->s), str, len);
+    ZSTR_LEN(dest->s) = new_len;
+}
+
+static inline void smart_str_append_double(smart_str *str, double num, int precision, bool zero_fraction) {
+    char buf[ZEND_DOUBLE_MAX_LENGTH];
+    /* Model snprintf precision behavior. */
+    zend_gcvt(num, precision ? precision : 1, '.', 'E', buf);
+    smart_str_appends(str, buf);
+    if (zero_fraction && zend_finite(num) && !strchr(buf, '.')) {
+        smart_str_appendl(str, ".0", 2);
+    }
+}
+
 #endif
 
 #if PHP_VERSION_ID < 80200
diff --git a/libdatadog b/libdatadog
index 2a2dc7fe927..fd298acb7ef 160000
--- a/libdatadog
+++ b/libdatadog
@@ -1 +1 @@
-Subproject commit 2a2dc7fe927331639a55b2e76555087d6faa3e94
+Subproject commit fd298acb7ef91528f6c91d840c3e0a94e36bf3c6