diff --git a/Makefile b/Makefile
index 904ffee..0d9f672 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ VERSION := development
 export
 
 ## Use env vars from latest release when reproducing
-ifeq ($(REPRODUCE),"TRUE")
+ifdef REPRODUCE
     include dist/release.env
     export
 endif
@@ -104,7 +104,7 @@ verify: | dist/manifest.txt
 
 .PHONY: reproduce
 reproduce: clean | out
-	$(MAKE)
+	$(MAKE) REPRODUCE=true
 	diff -q out/manifest.txt dist/manifest.txt;
 
 out: