diff --git a/pkgs/development/mobile/titaniumenv/build-app.nix b/pkgs/development/mobile/titaniumenv/build-app.nix
index 6f6d5f3d9f6b..2443bfe9aed8 100644
--- a/pkgs/development/mobile/titaniumenv/build-app.nix
+++ b/pkgs/development/mobile/titaniumenv/build-app.nix
@@ -67,7 +67,7 @@ stdenv.mkDerivation {
               security unlock-keychain -p "" $keychainName
               security import ${iosCertificate} -k $keychainName -P "${iosCertificatePassword}" -A
 
-              provisioningId=$(grep UUID -A1 -a ${iosMobileProvisioningProfile} | grep -o "[-A-Z0-9]\{36\}")
+              provisioningId=$(grep UUID -A1 -a ${iosMobileProvisioningProfile} | grep -o "[-A-Za-z0-9]\{36\}")
    
               # Ensure that the requested provisioning profile can be found
         
diff --git a/pkgs/development/mobile/xcodeenv/build-app.nix b/pkgs/development/mobile/xcodeenv/build-app.nix
index ade629759f09..b5766c805522 100644
--- a/pkgs/development/mobile/xcodeenv/build-app.nix
+++ b/pkgs/development/mobile/xcodeenv/build-app.nix
@@ -60,7 +60,7 @@ stdenv.mkDerivation {
         security import ${certificateFile} -k $keychainName -P "${certificatePassword}" -A 
 
         # Determine provisioning ID
-        PROVISIONING_PROFILE=$(grep UUID -A1 -a ${provisioningProfile} | grep -o "[-A-Z0-9]\{36\}")
+        PROVISIONING_PROFILE=$(grep UUID -A1 -a ${provisioningProfile} | grep -o "[-A-Za-z0-9]\{36\}")
 
         if [ ! -f "$HOME/Library/MobileDevice/Provisioning Profiles/$PROVISIONING_PROFILE.mobileprovision" ]
         then