diff --git a/libsrc/meshing/triarls.cpp b/libsrc/meshing/triarls.cpp
index d82806e9..9477ac3c 100644
--- a/libsrc/meshing/triarls.cpp
+++ b/libsrc/meshing/triarls.cpp
@@ -299,7 +299,7 @@ const char * triarules[] = {
 "(1, 0) { 1 X2 } { };\n",\
 "(1.5, 0.866) { 2 X2, 1 X3 } { 1 Y3 };\n",\
 "(1, 1.732) { 2 X2, 2 X3 } { 2 Y3 };\n",\
-"(0, 1.732) { -1 X2, 2 X3 } { 2 Y3 };\n",\
+"(0, 1.732) { 1 X2, 2 X3 } { 2 Y3 };\n",\
 "(-0.5, 0.866) { 1 X3 } {1 Y3 };\n",\
 "\n",\
 "elements\n",\