diff --git a/GNUmakefile b/GNUmakefile
index 0ab6bc6fb..8c55531ef 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -75,6 +75,11 @@ ifeq (FreeBSD,$(THIS_OS))
 ALL_TARGETS = freebsd_amd64
 endif
 
+# Allow overriding ALL_TARGETS via $TARGETS
+ifdef TARGETS
+ALL_TARGETS = $(TARGETS)
+endif
+
 SUPPORTED_OSES = Darwin Linux FreeBSD Windows MSYS_NT
 
 CGO_ENABLED = 1