diff --git a/dev-scheme/gerbil/gerbil-0.16.ebuild b/dev-scheme/gerbil/gerbil-0.16.ebuild
index eb31eb73df..c33e3d2622 100644
--- a/dev-scheme/gerbil/gerbil-0.16.ebuild
+++ b/dev-scheme/gerbil/gerbil-0.16.ebuild
@@ -42,6 +42,7 @@ src_prepare() {
 	# Just to be safe, because './configure --help' says:
 	# "Set default GERBIL_HOME (environment variable still overrides)"
 	unset GERBIL_HOME
+	unset GERBIL_PATH
 	xdg_environment_reset
 
 	# Verbose build process
diff --git a/dev-scheme/gerbil/gerbil-9999.ebuild b/dev-scheme/gerbil/gerbil-9999.ebuild
index eb31eb73df..c33e3d2622 100644
--- a/dev-scheme/gerbil/gerbil-9999.ebuild
+++ b/dev-scheme/gerbil/gerbil-9999.ebuild
@@ -42,6 +42,7 @@ src_prepare() {
 	# Just to be safe, because './configure --help' says:
 	# "Set default GERBIL_HOME (environment variable still overrides)"
 	unset GERBIL_HOME
+	unset GERBIL_PATH
 	xdg_environment_reset
 
 	# Verbose build process