diff --git a/.github/workflows/build_osx.yml b/.github/workflows/build_osx.yml
index 1a99763fc3..43404a44a8 100644
--- a/.github/workflows/build_osx.yml
+++ b/.github/workflows/build_osx.yml
@@ -102,7 +102,7 @@ jobs:
           # INSTALL_RPATH to "@loader_path" on Apple.
           CXXFLAGS="-O3" CFLAGS="-O3 ${DARWIN_C_SOURCE}" ADD_COMMIT_SHA=1 BUILD_CFG=Release \
             BUILD_BONSAIVIEWER=ON QT_DIR="${QT_DIR}" \
-            python3 ./nix/build-all.py -v --diskcleanup --shared ${MAC_INTEL} \
+            python3 ./nix/build-all.py -v --diskcleanup --ifcopenshell-shared ${MAC_INTEL} \
             | tee build.log
 
       - name: Upload Build Logs
diff --git a/.github/workflows/build_rocky.yml b/.github/workflows/build_rocky.yml
index 7c1343f349..d6c3f50c6d 100644
--- a/.github/workflows/build_rocky.yml
+++ b/.github/workflows/build_rocky.yml
@@ -80,7 +80,7 @@ jobs:
           set -o pipefail
           CXXFLAGS="-O3" CFLAGS="-O3" ADD_COMMIT_SHA=1 BUILD_CFG=Release BUILD_BONSAIVIEWER=ON \
             uv run --with aqtinstall ./nix/build-all.py \
-            -v --diskcleanup --shared 2>&1 \
+            -v --diskcleanup --ifcopenshell-shared 2>&1 \
             | tee build.log
 
       - name: Upload Build Logs
diff --git a/.github/workflows/build_rocky_arm.yml b/.github/workflows/build_rocky_arm.yml
index 51eb2f3b31..b805d81436 100644
--- a/.github/workflows/build_rocky_arm.yml
+++ b/.github/workflows/build_rocky_arm.yml
@@ -92,7 +92,7 @@ jobs:
           set -o pipefail
           CXXFLAGS="-O3" CFLAGS="-O3" ADD_COMMIT_SHA=1 BUILD_CFG=Release BUILD_BONSAIVIEWER=ON \
             uv run --with aqtinstall ./nix/build-all.py \
-            -v --diskcleanup --shared 2>&1 \
+            -v --diskcleanup --ifcopenshell-shared 2>&1 \
             | tee build.log
 
       - name: Upload Build Logs
diff --git a/nix/build-all.py b/nix/build-all.py
index bf0fe3897b..f3697f2f67 100644
--- a/nix/build-all.py
+++ b/nix/build-all.py
@@ -36,6 +36,8 @@ Available arguments:
     ``-without-xxx`` - do not build dependency ``xxx`` (e.g. ``--without-swig``)
     ``-mac-cross-compile-intel`` - cross compile for Intel Mac on Apple Silicon host
     ``-shared`` - build shared libraries. By default will build static.
+    ``-ifcopenshell-shared`` - build only IfcOpenShell's own libraries as shared
+        (dependencies stay static). Redundant if ``-shared`` is also passed.
     ``-diskcleanup`` - clean up build directories after finishing building dependencies
     ``-v`` - enable verbose logs
 
@@ -380,6 +382,9 @@ else:
 
 OFF_ON = ["OFF", "ON"]
 BUILD_STATIC = "shared" not in flags
+"""Whether dependencies are built static."""
+IFCOPENSHELL_STATIC = BUILD_STATIC and "ifcopenshell-shared" not in flags
+"""Whether IfcOpenShell's own libraries are built static."""
 ENABLE_FLAG = "--enable-static" if BUILD_STATIC else "--enable-shared"
 DISABLE_FLAG = "--disable-shared" if BUILD_STATIC else "--disable-static"
 LINK_TYPE = "static" if BUILD_STATIC else "shared"
@@ -1411,7 +1416,7 @@ os.makedirs(ifcos_build_dir, exist_ok=True)
 cmake_args = [
     "-DUSE_MMAP=OFF",
     "-DBUILD_EXAMPLES=OFF",
-    "-DBUILD_SHARED_LIBS=" + OFF_ON[not BUILD_STATIC],
+    "-DBUILD_SHARED_LIBS=" + OFF_ON[not IFCOPENSHELL_STATIC],
     "-DGLTF_SUPPORT=ON",
     "-DBoost_NO_BOOST_CMAKE=On",
     "-DCREATE_BUNDLE=On",