diff --git a/Backends/Audio2/WASAPI/Sources/kinc/backend/wasapi.c b/Backends/Audio2/WASAPI/Sources/kinc/backend/wasapi.c
index 9746d49ea..33f7e0cea 100644
--- a/Backends/Audio2/WASAPI/Sources/kinc/backend/wasapi.c
+++ b/Backends/Audio2/WASAPI/Sources/kinc/backend/wasapi.c
@@ -63,7 +63,7 @@ DEFINE_GUID(IID_IMMDeviceEnumerator, 0xA95664D2, 0x9614, 0x4F35, 0xA7, 0x46, 0xD
 DEFINE_GUID(CLSID_MMDeviceEnumerator, 0xBCDE0395, 0xE52F, 0x467C, 0x8E, 0x3D, 0xC4, 0x57, 0x92, 0x91, 0x69, 0x2E);
 
 // based on the implementation in soloud and Microsoft sample code
-static volatile void (*a2_callback)(kinc_a2_buffer_t *buffer, uint32_t samples, void *userdata) = NULL;
+static void (*volatile a2_callback)(kinc_a2_buffer_t *buffer, uint32_t samples, void *userdata) = NULL;
 static void *a2_userdata = NULL;
 static kinc_a2_buffer_t a2_buffer;