diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 88f349e25f..5f9ab34d34 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -44,9 +44,9 @@ jobs:
               -DD_COMPILER_FLAGS=-gcc=/usr/bin/c++
             extra_cmake_flags: >-
               -DBUILD_LTO_LIBS=ON
-              -DD_COMPILER_FLAGS="-gcc=/usr/bin/c++ -O -flto=full -defaultlib=phobos2-ldc-lto,druntime-ldc-lto -func-specialization-size-threshold=1000000000"
+              -DD_COMPILER_FLAGS="-gcc=/usr/bin/c++ -O -flto=full -defaultlib=phobos2-ldc-lto,druntime-ldc-lto -func-specialization-size-threshold=1000000000 -Xcc=-Wl,-llvm,-func-specialization-size-threshold=1000000000"
               -DEXTRA_CXXFLAGS=-flto=full
-            with_pgo: false
+            with_pgo: true
 
           - job_name: Windows x64
             os: windows-2022
@@ -56,7 +56,7 @@ jobs:
               -DBUILD_LTO_LIBS=ON
               "-DD_COMPILER_FLAGS=-O -flto=full -defaultlib=phobos2-ldc-lto,druntime-ldc-lto -func-specialization-size-threshold=1000000000"
               -DEXTRA_CXXFLAGS=-flto=full
-            with_pgo: false
+            with_pgo: true
 
           - job_name: Windows x86
             os: windows-2022