diff --git a/pkgs/development/compilers/llvm/3.5/default.nix b/pkgs/development/compilers/llvm/3.5/default.nix
index f588eb4407b..b87fa747f14 100644
--- a/pkgs/development/compilers/llvm/3.5/default.nix
+++ b/pkgs/development/compilers/llvm/3.5/default.nix
@@ -6,7 +6,7 @@ let
 
   fetch = fetch_v version;
   fetch_v = ver: name: sha256: fetchurl {
-    url = "http://llvm.org/releases/${ver}/${name}-${ver}.src.tar.xz";
+    url = "https://releases.llvm.org/${ver}/${name}-${ver}.src.tar.xz";
     inherit sha256;
   };
 
diff --git a/pkgs/development/compilers/llvm/3.7/default.nix b/pkgs/development/compilers/llvm/3.7/default.nix
index f176894dedb..3c557711449 100644
--- a/pkgs/development/compilers/llvm/3.7/default.nix
+++ b/pkgs/development/compilers/llvm/3.7/default.nix
@@ -9,7 +9,7 @@ let
 
   fetch = fetch_v version;
   fetch_v = ver: name: sha256: fetchurl {
-    url = "http://llvm.org/releases/${ver}/${name}-${ver}.src.tar.xz";
+    url = "https://releases.llvm.org/${ver}/${name}-${ver}.src.tar.xz";
     inherit sha256;
   };
 
diff --git a/pkgs/development/compilers/llvm/3.8/default.nix b/pkgs/development/compilers/llvm/3.8/default.nix
index 99869e6e80a..a848c8b9252 100644
--- a/pkgs/development/compilers/llvm/3.8/default.nix
+++ b/pkgs/development/compilers/llvm/3.8/default.nix
@@ -8,7 +8,7 @@ let
 
   fetch = fetch_v version;
   fetch_v = ver: name: sha256: fetchurl {
-    url = "http://llvm.org/releases/${ver}/${name}-${ver}.src.tar.xz";
+    url = "https://releases.llvm.org/${ver}/${name}-${ver}.src.tar.xz";
     inherit sha256;
   };
 
diff --git a/pkgs/development/compilers/llvm/3.9/default.nix b/pkgs/development/compilers/llvm/3.9/default.nix
index 01c08f4bd20..752790cdd85 100644
--- a/pkgs/development/compilers/llvm/3.9/default.nix
+++ b/pkgs/development/compilers/llvm/3.9/default.nix
@@ -8,7 +8,7 @@ let
 
   fetch = fetch_v version;
   fetch_v = ver: name: sha256: fetchurl {
-    url = "http://llvm.org/releases/${version}/${name}-${ver}.src.tar.xz";
+    url = "https://releases.llvm.org/${version}/${name}-${ver}.src.tar.xz";
     inherit sha256;
   };
 
diff --git a/pkgs/development/compilers/llvm/5/default.nix b/pkgs/development/compilers/llvm/5/default.nix
index 38d2b0d461d..68ee80fa7a6 100644
--- a/pkgs/development/compilers/llvm/5/default.nix
+++ b/pkgs/development/compilers/llvm/5/default.nix
@@ -9,7 +9,7 @@ let
   version = release_version; # differentiating these is important for rc's
 
   fetch = name: sha256: fetchurl {
-    url = "http://llvm.org/releases/${release_version}/${name}-${version}.src.tar.xz";
+    url = "https://releases.llvm.org/${release_version}/${name}-${version}.src.tar.xz";
     inherit sha256;
   };
 
diff --git a/pkgs/development/compilers/llvm/6/default.nix b/pkgs/development/compilers/llvm/6/default.nix
index 831e4b65344..5ee551f6b6b 100644
--- a/pkgs/development/compilers/llvm/6/default.nix
+++ b/pkgs/development/compilers/llvm/6/default.nix
@@ -9,7 +9,7 @@ let
   version = release_version; # differentiating these is important for rc's
 
   fetch = name: sha256: fetchurl {
-    url = "http://releases.llvm.org/${release_version}/${name}-${version}.src.tar.xz";
+    url = "https://releases.llvm.org/${release_version}/${name}-${version}.src.tar.xz";
     inherit sha256;
   };
 
diff --git a/pkgs/development/compilers/llvm/7/default.nix b/pkgs/development/compilers/llvm/7/default.nix
index 9328d830edf..5446f1b362a 100644
--- a/pkgs/development/compilers/llvm/7/default.nix
+++ b/pkgs/development/compilers/llvm/7/default.nix
@@ -9,7 +9,7 @@ let
   version = release_version; # differentiating these is important for rc's
 
   fetch = name: sha256: fetchurl {
-    url = "http://releases.llvm.org/${release_version}/${name}-${version}.src.tar.xz";
+    url = "https://releases.llvm.org/${release_version}/${name}-${version}.src.tar.xz";
     inherit sha256;
   };