diff --git a/llvm/include/llvm-c/Transforms/PassBuilder.h b/llvm/include/llvm-c/Transforms/PassBuilder.h
--- a/llvm/include/llvm-c/Transforms/PassBuilder.h
+++ b/llvm/include/llvm-c/Transforms/PassBuilder.h
@@ -99,6 +99,9 @@
 void LLVMPassBuilderOptionsSetMergeFunctions(LLVMPassBuilderOptionsRef Options,
                                              LLVMBool MergeFunctions);
 
+void LLVMPassBuilderOptionsSetInlinerThreshold(
+    LLVMPassBuilderOptionsRef Options, int Threshold);
+
 /**
  * Dispose of a heap-allocated PassBuilderOptions instance
  */
diff --git a/llvm/lib/Passes/PassBuilderBindings.cpp b/llvm/lib/Passes/PassBuilderBindings.cpp
--- a/llvm/lib/Passes/PassBuilderBindings.cpp
+++ b/llvm/lib/Passes/PassBuilderBindings.cpp
@@ -139,6 +139,11 @@
   unwrap(Options)->PTO.MergeFunctions = MergeFunctions;
 }
 
+void LLVMPassBuilderOptionsSetInlinerThreshold(
+    LLVMPassBuilderOptionsRef Options, int Threshold) {
+  unwrap(Options)->PTO.InlinerThreshold = Threshold;
+}
+
 void LLVMDisposePassBuilderOptions(LLVMPassBuilderOptionsRef Options) {
   delete unwrap(Options);
 }