diff --git a/etc/config/m4/WindowsPackage.m4 b/etc/config/m4/WindowsPackage.m4
index 8c59ddc7d..896b82905 100644
--- a/etc/config/m4/WindowsPackage.m4
+++ b/etc/config/m4/WindowsPackage.m4
@@ -170,7 +170,7 @@ IFMPI Source: "examples\hpddm\*.edp"; DestDir: "{app}\examples\hpddm"
 
 ;PETSc
 ;IFPETSC Source: "FFPETSC\*"; DestDir: "{app}\ff-petsc"; Flags: recursesubdirs
-IFPETSC Source: "C:\msys64\mingw64\ff-petsc\*"; DestDir: "{app}\ff-petsc"; Flags: recursesubdirs
+IFPETSC Source: "C:\mingw64\ff-petsc\*"; DestDir: "{app}\ff-petsc"; Flags: recursesubdirs
 
 ; Documentation files may need to be copied from another machine if
 ; Cygwin refuses to build them.