diff --git a/Makefile b/Makefile
index 935642f..fb78e9a 100644
--- a/Makefile
+++ b/Makefile
@@ -32,7 +32,7 @@ ifeq ($(shell which apt-get),)
 	$(warning Cannot install build dependencies without apt.)
 	$(warning Cannot install build dependencies on non-linux platforms.)
 else ifeq ($(wildcard /usr/include/libxml2/libxml/xpath.h),)
-	sudo apt-get install libxml2-dev libxslt1-dev
+	sudo $(APT) install libxml2-dev libxslt1-dev
 else ifeq ($(wildcard /usr/include/libxslt/xslt.h),)
-	sudo apt-get install libxslt1-dev
+	sudo $(APT) install libxslt1-dev
 endif
diff --git a/common.mk b/common.mk
index abbe100..4e6b0a9 100644
--- a/common.mk
+++ b/common.mk
@@ -7,6 +7,11 @@ DOCS=docs
 ifneq ($(OS),Windows_NT)
 	OS := $(shell uname)
 endif
+ifdef CI
+    APT := apt-get --yes
+else
+	APT := apt-get
+endif
 
 .DEFAULT_GOAL := help