diff --git a/.github/workflows/sharedgc-macos.yml b/.github/workflows/sharedgc-macos.yml
index d34a20cb7419a6..80daf65e863333 100644
--- a/.github/workflows/sharedgc-macos.yml
+++ b/.github/workflows/sharedgc-macos.yml
@@ -101,7 +101,7 @@ jobs:
 
       - name: Build shared GC
         run: |
-          echo "RUBY_GC_LIBRARY=librubygc.${{ matrix.gc_name }}.dylib" >> $GITHUB_ENV
+          echo "RUBY_GC_LIBRARY=${{ matrix.gc_name }}" >> $GITHUB_ENV
           make shared-gc SHARED_GC=${{ matrix.gc_name }} MMTK_BUILD=${{ matrix.build }}
 
       - name: Verify MMTk bindgen
diff --git a/.github/workflows/sharedgc-ubuntu.yml b/.github/workflows/sharedgc-ubuntu.yml
index 7f91229b240dec..f68bf226a11f5f 100644
--- a/.github/workflows/sharedgc-ubuntu.yml
+++ b/.github/workflows/sharedgc-ubuntu.yml
@@ -101,7 +101,7 @@ jobs:
 
       - name: Build shared GC
         run: |
-          echo "RUBY_GC_LIBRARY=librubygc.${{ matrix.gc_name }}.so" >> $GITHUB_ENV
+          echo "RUBY_GC_LIBRARY=${{ matrix.gc_name }}" >> $GITHUB_ENV
           make shared-gc SHARED_GC=${{ matrix.gc_name }} MMTK_BUILD=${{ matrix.build }}
 
       - name: Verify MMTk bindgen