1 files changed, 4 insertions, 4 deletions
diff --git a/lc3.c b/lc3.c
index f21ce27..1b08f79 100644
--- a/lc3.c
+++ b/lc3.c
@@ -25,8 +25,8 @@ enum Register
 	REGISTER_R7,
 	REGISTER_PC,
 	REGISTER_PSR,
-	REGISTER_SSR,
-	REGISTER_USR,
+	REGISTER_SSP,
+	REGISTER_USP,
 	REGISTER_COUNT,
 };
 
@@ -175,8 +175,8 @@ void fire(const uint16_t interrupt, const uint16_t priority)
 	if (FLAG_SUP & registers[REGISTER_PSR])
 	{
 		registers[REGISTER_PSR] &= ~FLAG_SUP;
-		registers[REGISTER_USR] = registers[REGISTER_R6];
-		registers[REGISTER_R6] = registers[REGISTER_SSR];
+		registers[REGISTER_USP] = registers[REGISTER_R6];
+		registers[REGISTER_R6] = registers[REGISTER_SSP];
 	}
 	registers[REGISTER_R6]--;
 	memory[registers[REGISTER_R6]] = registers[REGISTER_PSR];