diff --git a/lang/modules/main.txt b/lang/modules/main.txt
index 44f26ae..aef89dc 100644
--- a/lang/modules/main.txt
+++ b/lang/modules/main.txt
@@ -8,12 +8,12 @@
 Return A
 EndFunction
 Function GetHalfish Args Num
-Set FinalNum To Num Minus 2
+Set FinalNum To Num Subtract 2
 Return FinalNum
 EndFunction
 Function MakeNumber
 Set Halfish To Self GetHalfish 620
 Set Double To Halfish Add Halfish
-Set Final To Double Minus 2
+Set Final To Double Subtract 2
 Return Final
 EndFunction
diff --git a/lang/number.c b/lang/number.c
index e0210a9..d9ca66e 100644
--- a/lang/number.c
+++ b/lang/number.c
@@ -29,7 +29,7 @@
 }
 
 #define OP_ADD (void *)1
-#define OP_MINUS (void *)2
+#define OP_SUBTRACT (void *)2
 
 static void number_math(VmState state, Object obj, void *priv) {
 	int arg_count = vm_stack_depth(state);
@@ -38,7 +38,7 @@
 	int result = 0;
 	if (priv == OP_ADD) {
 		result = number_value(obj) + number_value(arg1);
-	} else if (priv == OP_MINUS) {
+	} else if (priv == OP_SUBTRACT) {
 		result = number_value(obj) - number_value(arg1);
 	} else {
 		abort_msg("number_math called with invalid priv");
@@ -50,7 +50,7 @@
 
 static struct object_call calls[] = {
 	{.name = "Add", .handler = number_math, .priv = OP_ADD},
-	{.name = "Minus", .handler = number_math, .priv = OP_MINUS},
+	{.name = "Subtract", .handler = number_math, .priv = OP_SUBTRACT},
 	{.name = NULL, /* end */}};
 
 static struct object_class num_class = {