diff --git a/readme.md b/readme.md
index cecc55d86..e23955ec5 100644
--- a/readme.md
+++ b/readme.md
@@ -138,8 +138,7 @@ Setting up TCC:
 
 Compiling with TCC:
 1. Navigate to the directory with ClassiCube's source code
-2. In `ExtMath.c`, change `fabsf` to `fabs` and `sqrtf` to `sqrt`
-3. Run `tcc.exe -o ClassiCube.exe src/*.c third_party/bearssl/*.c -lwinmm -lgdi32 -luser32 -lcomdlg32 -lshell32`<br>
+2. Run `tcc.exe -o ClassiCube.exe src/*.c third_party/bearssl/*.c -lwinmm -lgdi32 -luser32 -lcomdlg32 -lshell32`<br>
 (Note: You may need to specify the full path to `tcc.exe` instead of just `tcc.exe`)
 
 ## Compiling - Linux
diff --git a/third_party/bearssl/config.h b/third_party/bearssl/config.h
index ff6fabc40..3ef9dbf20 100644
--- a/third_party/bearssl/config.h
+++ b/third_party/bearssl/config.h
@@ -47,6 +47,11 @@
 #define BR_USE_URANDOM 0
 #define BR_USE_GETENTROPY 0
 
+/* intrin.h doesn't exist in older TinyC */
+#if defined __TINYC__
+#define BR_INT128 0
+#endif
+
 /*
  * When BR_64 is enabled, 64-bit integer types are assumed to be
  * efficient (i.e. the architecture has 64-bit registers and can