diff --git a/ext/ddtrace.c b/ext/ddtrace.c
index 60940e9751c..b9ee9e8da60 100644
--- a/ext/ddtrace.c
+++ b/ext/ddtrace.c
@@ -424,6 +424,7 @@ void disable_sidecar_sending(void){
     zend_alter_ini_entry(zai_config_memoized_entries[DDTRACE_CONFIG_DD_TRACE_SIDECAR_TRACE_SENDER].ini_entries[0]->name, zero,
                     ZEND_INI_SYSTEM, ZEND_INI_STAGE_RUNTIME);
     zend_string_release(zero);
+    ZVAL_FALSE(&zai_config_memoized_entries[DDTRACE_CONFIG_DD_TRACE_SIDECAR_TRACE_SENDER].decoded_value);
 }
 #endif
 
diff --git a/tests/ext/dd_trace_send_traces_via_thread_001.phpt b/tests/ext/dd_trace_send_traces_via_thread_001.phpt
index 0a53eb1b7b6..bc94e4c99c0 100644
--- a/tests/ext/dd_trace_send_traces_via_thread_001.phpt
+++ b/tests/ext/dd_trace_send_traces_via_thread_001.phpt
@@ -2,6 +2,8 @@
 background sender happy path
 --SKIPIF--
 <?php if (strncasecmp(PHP_OS, "WIN", 3) == 0) die('skip: There is no background sender on Windows'); ?>
+--INI--
+datadog.trace.sidecar_trace_sender=0
 --FILE--
 <?php