diff --git a/modules/vec2.lua b/modules/vec2.lua
index c7f2adc..4dd570e 100644
--- a/modules/vec2.lua
+++ b/modules/vec2.lua
@@ -68,7 +68,7 @@ function vector.__add(a,b)
 	if type(a) == "number" then
 		return new(a+b.x, a+b.y)
 	elseif type(b) == "number" then
-		return new(b+a.x, b+a.y)
+		return new(a.x+b, a.y+b)
 	else
 		assert(isvector(a) and isvector(b), "Add: wrong argument types (<vector> expected)")
 		return new(a.x+b.x, a.y+b.y)
@@ -79,7 +79,7 @@ function vector.__sub(a,b)
 	if type(a) == "number" then
 		return new(a-b.x, a-b.y)
 	elseif type(b) == "number" then
-		return new(b-a.x, b-a.y)
+		return new(a.x-b, a.y-b)
 	else
 		assert(isvector(a) and isvector(b), "Sub: wrong argument types (<vector> expected)")
 		return new(a.x-b.x, a.y-b.y)
diff --git a/modules/vec3.lua b/modules/vec3.lua
index eff511c..43e1b92 100644
--- a/modules/vec3.lua
+++ b/modules/vec3.lua
@@ -85,7 +85,7 @@ function vector.__add(a,b)
 	if type(a) == "number" then
 		return new(a+b.x, a+b.y, a+b.z)
 	elseif type(b) == "number" then
-		return new(b+a.x, b+a.y, b+a.z)
+		return new(a.x+b, a.y+b, a.z+b)
 	else
 		assert(isvector(a) and isvector(b), "Add: wrong argument types (<vector> expected)")
 		return new(a.x+b.x, a.y+b.y, a.z+b.z)
@@ -96,7 +96,7 @@ function vector.__sub(a,b)
 	if type(a) == "number" then
 		return new(a-b.x, a-b.y, a-b.z)
 	elseif type(b) == "number" then
-		return new(b-a.x, b-a.y, b-a.z)
+		return new(a.x-b, a.y-b, a.z-b)
 	else
 		assert(isvector(a) and isvector(b), "Sub: wrong argument types (<vector> expected)")
 		return new(a.x-b.x, a.y-b.y, a.z-b.z)