diff --git a/Makefile b/Makefile
index 9dbd76e..824afa2 100644
--- a/Makefile
+++ b/Makefile
@@ -22,24 +22,26 @@ SRCPAGES := $(shell find $(SRCDIR)/pages/* -name '*.scm')
 SRCSTYLES := $(shell find $(SRCDIR)/styles/* -name '*.scm')
 SRCJS := $(shell find $(SRCDIR)/scripts/* -name '*.js')
 
+BUILDTIME=$(shell date "+%s")
+
 all: $(OUTDIR) $(STATICDIR) pages styles js
 
 pages: $(SRCPAGES)
 	for page in $(SRCPAGES) ; do \
-		$(SCHEME) $(SCHEMEFLAGS) $$page \
+		$(SCHEME) $(SCHEMEFLAGS) -e "(define build-time $(BUILDTIME))" -s $$page \
 			| sed -f scripts/minify-html.sed \
 			> $$(echo $$page | sed 's/.*\/pages/dist/' | sed 's/scm/xhtml/') \
 	; done
 
 styles: $(SRCSTYLES)
 	for style in $(SRCSTYLES) ; do \
-		$(SCHEME) $(SCHEMEFLAGS) $$style \
-			> $$(echo $$style | sed 's/.*\/styles/dist/' | sed 's/scm/css/') \
+		$(SCHEME) $(SCHEMEFLAGS) -e "(define build-time $(BUILDTIME))" -s $$style \
+			> $$(echo $$style | sed 's/.*\/styles/dist/' | sed 's/scm/$(BUILDTIME).css/') \
 	; done
 
 js: $(SRCJS)
 	for script in $(SRCJS) ; do \
-		cp $$script $$(echo $$script | sed 's/.*\/scripts/dist/') \
+		cp $$script $$(echo $$script | sed 's/.*\/scripts/dist/' | sed 's/js/$(BUILDTIME).js/') \
 	; done
 
 $(OUTDIR):
diff --git a/config.mk b/config.mk
index 4294469..54bc47a 100644
--- a/config.mk
+++ b/config.mk
@@ -16,7 +16,7 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 SCHEME=csi
-SCHEMEFLAGS=-s
+SCHEMEFLAGS=
 
 SRCDIR=src
 STATICDIR=public
diff --git a/src/templates/clean.scm b/src/templates/clean.scm
index 2590363..2f13c41 100644
--- a/src/templates/clean.scm
+++ b/src/templates/clean.scm
@@ -16,6 +16,13 @@
 ;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 (import scss)
+(import (chicken string))
+
+(define (path-with-build-time path suffix)
+ (string-translate* path
+                    `((,suffix . ,(string-intersperse
+                                  `("." ,(number->string build-time) ,suffix)
+                                  "")))))
 
 (define (clean-tpl
          page-title
@@ -40,7 +47,8 @@
                   `(meta ,(append '(@) args))) page-meta)
 
           ,(map (lambda (l)
-                  `(link (@ (rel "stylesheet") (href ,l))))
+                  `(link (@ (rel "stylesheet")
+                            (href ,(path-with-build-time l ".css")))))
                 page-styles)
 
           (title ,page-title)
@@ -51,4 +59,9 @@
          (body
           ,page-content
 
-          ,(map (lambda (l) `(script (@ (src ,l) (type "text/javascript")) " ")) page-scripts))))
+          ,(map
+            (lambda (l)
+             `(script (@ (src ,(path-with-build-time l ".js"))
+                         (type "text/javascript"))
+               " "))
+            page-scripts))))