diff --git a/repertory.iss.in b/repertory.iss.in
index abbd5c5f..86f6bc5a 100644
--- a/repertory.iss.in
+++ b/repertory.iss.in
@@ -165,5 +165,5 @@ Name: "{group}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Parameters: "-u
 Name: "{userstartup}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Parameters: "-ui -lo --hidden"; IconFilename: "{app}\icon.ico"
 
 [Run]
-Filename: "msiexec.exe"; WorkingDir: "{app}"; Parameters: "/a winfsp-@WINFSP_VERSION@.msi /norestart"; \
+Filename: "msiexec.exe"; WorkingDir: "{app}"; Parameters: "/i winfsp-@WINFSP_VERSION@.msi /norestart"; \
   Flags: 64bit waituntilterminated; Components: winfsp