diff --git a/Build-Windows.md b/Build-Windows.md
index 5275925..5780e98 100644
--- a/Build-Windows.md
+++ b/Build-Windows.md
@@ -126,7 +126,7 @@ For instance,
   -  `mir_sdr_api` : SDRPlay provides binaries for most common platforms (see SoapySDRPlay section below)
  
 ### pthreads-win32
-* Download the ZIP of pre-compiled binaries from ftp://sourceware.org/pub/pthreads-win32/pthreads-w32-2-9-1-release.zip 
+* Download the ZIP of pre-compiled binaries from https://sourceware.org/pub/pthreads-win32/pthreads-w32-2-9-1-release.zip 
 * Unpack it as the following:
 ````
 C:\MSVCDev\pthreads-win32\lib\x64\pthreadVC2.lib