diff --git a/master/master.cfg b/master/master.cfg
index 49d69754..ac3b1f29 100644
--- a/master/master.cfg
+++ b/master/master.cfg
@@ -1274,9 +1274,10 @@ def create_halide_builders():
     yield create_halide_builder('x86', 32, 'linux', HALIDE_MAIN, LLVM_MAIN, Purpose.halide_testbranch, BuildSystem.make)
     yield create_halide_builder('x86', 64, 'osx', HALIDE_MAIN, LLVM_MAIN, Purpose.halide_testbranch, BuildSystem.make)
 
-    # Test pull requests for Halide master against the current and previous LLVM, for at least one target.
+    # Test pull requests for Halide master against all the LLVM versions we still support, for at least one target.
     for llvm_branch in LLVM_BRANCHES:
-        if abs(LLVM_BRANCHES[llvm_branch].version.major - LLVM_BRANCHES[LLVM_MAIN].version.major) in [1, 2]:
+        # We already handled LLVM for testbranches against main in the loop above.
+        if llvm_branch != LLVM_MAIN:
             yield create_halide_builder('x86', 64, 'linux', HALIDE_MAIN, llvm_branch, Purpose.halide_testbranch)