diff --git a/b2g/config/mozconfigs/win32_gecko/nightly b/b2g/config/mozconfigs/win32_gecko/nightly
index dce88c47ed8..56d8dc7c9a8 100644
--- a/b2g/config/mozconfigs/win32_gecko/nightly
+++ b/b2g/config/mozconfigs/win32_gecko/nightly
@@ -22,12 +22,6 @@ else
   . $topsrcdir/build/win32/mozconfig.vs2010
 fi
 
-# For known full-clobber builds on Windows (like nightlies/try), 
-# this speeds things up. IS_NIGHTLY is set by the build automation.
-if test "$IS_NIGHTLY" != ""; then 
-  ac_add_options --disable-auto-deps
-fi
-
 # B2G Options
 ac_add_options --enable-application=b2g
 ac_add_options --enable-marionette
diff --git a/browser/config/mozconfigs/win32/nightly b/browser/config/mozconfigs/win32/nightly
index 1bda1f039c6..a0399ae4172 100644
--- a/browser/config/mozconfigs/win32/nightly
+++ b/browser/config/mozconfigs/win32/nightly
@@ -25,9 +25,3 @@ fi
 
 # Package js shell.
 export MOZ_PACKAGE_JSSHELL=1
-
-# For known full-clobber builds on Windows (like nightlies/try), 
-# this speeds things up. IS_NIGHTLY is set by the build automation.
-if test "$IS_NIGHTLY" != ""; then 
-  ac_add_options --disable-auto-deps
-fi
diff --git a/browser/config/mozconfigs/win64/nightly b/browser/config/mozconfigs/win64/nightly
index e9e7b558fdd..de6ab34ce6d 100644
--- a/browser/config/mozconfigs/win64/nightly
+++ b/browser/config/mozconfigs/win64/nightly
@@ -23,10 +23,4 @@ mk_add_options MOZ_MAKE_FLAGS=-j1
 # Package js shell.
 export MOZ_PACKAGE_JSSHELL=1
 
-# For known full-clobber builds on Windows (like nightlies/try), 
-# this speeds things up. IS_NIGHTLY is set by the build automation.
-if test "$IS_NIGHTLY" != ""; then 
-  ac_add_options --disable-auto-deps
-fi
-
 . $topsrcdir/build/win64/mozconfig.vs2010