diff --git a/appveyor.yml b/appveyor.yml
index 543a7078..8d4f43cf 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -19,6 +19,9 @@ init:
 
 install:
     - choco install nsis -y -pre
+    # Replace makensis.exe and files with special long string build. This should
+    # prevent issues when setting PATH during installation.
+    - 7z -e "tools\nsis-3.04-strlen_8192.zip" -o"C:\Program Files (x86)\NSIS\"
     - build_win all
     - refreshenv
     # We need to reload vcvars after refreshing
diff --git a/tools/nsis-3.04-strlen_8192.zip b/tools/nsis-3.04-strlen_8192.zip
new file mode 100644
index 00000000..4e54e0a6
Binary files /dev/null and b/tools/nsis-3.04-strlen_8192.zip differ