diff --git a/easybuild/easyblocks/c/clang_aomp.py b/easybuild/easyblocks/c/clang_aomp.py
index caca76e767..b1f66e2426 100644
--- a/easybuild/easyblocks/c/clang_aomp.py
+++ b/easybuild/easyblocks/c/clang_aomp.py
@@ -233,7 +233,7 @@ def _configure_llvm(self, component):
             "-DLLVM_ENABLE_PROJECTS='clang;lld;clang-tools-extra'",
             "-DLLVM_ENABLE_RUNTIMES='compiler-rt;libcxx;libcxxabi'",
             "-DCLANG_DEFAULT_LINKER=lld",
-            "-DGCC_INSTALL_PREFIX=$EBROOTGCCCORE",
+            "-DGCC_INSTALL_PREFIX=%s" % os.getenv('EBROOTGCCCORE'),
             "-DLLVM_ENABLE_ASSERTIONS=ON",
             "-DLLVM_ENABLE_BINDINGS=OFF",
             "-DLLVM_INCLUDE_BENCHMARKS=OFF",