diff --git a/documentation/samples/system.ini b/documentation/samples/system.ini
index c4f15fffc80..45ec2bdc17b 100644
--- a/documentation/samples/system.ini
+++ b/documentation/samples/system.ini
@@ -8,5 +8,5 @@ vcr=mcivisca.drv
 MPEGVideo=mciqtz.drv
 
 [drivers32]
-MSACM.adpcm=imaadp32.acm
+MSACM.imaadpcm=imaadp32.acm
 MSACM.msadpcm=msadp32.acm