diff --git a/src/libultra/gu/cosf.c b/src/libultra/gu/cosf.c
index c911b55cb6..588a46a2cd 100644
--- a/src/libultra/gu/cosf.c
+++ b/src/libultra/gu/cosf.c
@@ -14,7 +14,7 @@ static const du P[] = {
     { 0.000002605780637968037 },
 };
 
-static const du rpi = { 1 / 3.14159265358979323846 }; // 1/F_PI, "reciprocal of pi"
+static const du rpi = { 1 / 3.14159265358979323846 }; // 1/M_PI, "reciprocal of pi"
 
 // pihi + pilo is the closest double to pi, this representation allows more precise calculations since pi itself is not
 // an exact float
diff --git a/src/libultra/gu/sinf.c b/src/libultra/gu/sinf.c
index 454a648caf..d3dfcc4524 100644
--- a/src/libultra/gu/sinf.c
+++ b/src/libultra/gu/sinf.c
@@ -14,7 +14,7 @@ static const du P[] = {
     { 0.000002605780637968037 },
 };
 
-static const du rpi = { 1 / 3.14159265358979323846 }; // 1/F_PI, "reciprocal of pi"
+static const du rpi = { 1 / 3.14159265358979323846 }; // 1/M_PI, "reciprocal of pi"
 
 // pihi + pilo is the closest double to pi, this representation allows more precise calculations since pi itself is not
 // an exact float