diff --git a/dev-tcltk/blt/blt-2.5.3-r4.ebuild b/dev-tcltk/blt/blt-2.5.3-r4.ebuild
index a12d4da3c194f..9d1b9133561c2 100644
--- a/dev-tcltk/blt/blt-2.5.3-r4.ebuild
+++ b/dev-tcltk/blt/blt-2.5.3-r4.ebuild
@@ -106,7 +106,7 @@ src_configure() {
 }
 
 src_compile() {
-	emake LDFLAGS="${LDFLAGS}"
+	emake -j1 LDFLAGS="${LDFLAGS}"
 }
 
 src_install() {
@@ -123,7 +123,7 @@ src_install() {
 		/usr/share/man/mann \
 		/usr/include
 
-	emake INSTALL_ROOT="${D}" install
+	emake -j1 INSTALL_ROOT="${D}" install
 
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