diff --git a/.github/workflows/precompile.yml b/.github/workflows/precompile.yml
index 26b85e8..4e5bb3a 100644
--- a/.github/workflows/precompile.yml
+++ b/.github/workflows/precompile.yml
@@ -69,6 +69,12 @@ jobs:
             gcc-powerpc64le-linux-gnu g++-powerpc64le-linux-gnu \
             gcc-s390x-linux-gnu g++-s390x-linux-gnu
 
+      - name: Set Swap Space
+        if: matrix.os == 'ubuntu-20.04'
+        uses: pierotofy/set-swap-space@master
+        with:
+          swap-size-gb: 10
+
       - name: Create precompiled library
         shell: bash
         run: |
diff --git a/Makefile b/Makefile
index c3f637a..31d48a3 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@ SRC_DIR = c_src
 
 CXXFLAGS = -O3 -std=c++11
 
-HEADERS_DIRS = $(sort $(dir $(shell find -E $(SRC_DIR) -regex ".*\.(hpp|h)")))
+HEADERS_DIRS = $(sort $(dir $(shell find $(SRC_DIR)/* | grep .h)))
 
 CXXFLAGS += -I"$(ERTS_INCLUDE_DIR)"
 CXXFLAGS += $(foreach header, $(HEADERS_DIRS), -I"$(header)")