diff --git a/app-text/mdbook/mdbook-0.4.37.ebuild b/app-text/mdbook/mdbook-0.4.37.ebuild
index 2b512da75f1f3..2e29e312d40c4 100644
--- a/app-text/mdbook/mdbook-0.4.37.ebuild
+++ b/app-text/mdbook/mdbook-0.4.37.ebuild
@@ -269,7 +269,7 @@ src_compile() {
 		if tc-is-cross-compiler; then
 			ewarn "html docs were skipped due to cross-compilation"
 		else
-			target/$(usex debug{,} release)/${PN} build -d html guide || die
+			"$(cargo_target_dir)"/${PN} build -d html guide || die
 		fi
 	fi
 }
diff --git a/app-text/mdbook/mdbook-0.4.40.ebuild b/app-text/mdbook/mdbook-0.4.40.ebuild
index e5e76b2f6ed64..5adbdeee6234e 100644
--- a/app-text/mdbook/mdbook-0.4.40.ebuild
+++ b/app-text/mdbook/mdbook-0.4.40.ebuild
@@ -280,7 +280,7 @@ src_compile() {
 		if tc-is-cross-compiler; then
 			ewarn "html docs were skipped due to cross-compilation"
 		else
-			target/$(usex debug{,} release)/${PN} build -d html guide || die
+			"$(cargo_target_dir)"/${PN} build -d html guide || die
 		fi
 	fi
 }