diff --git a/libc/src/math/x86_64/cos.cpp b/libc/src/math/x86_64/cos.cpp
--- a/libc/src/math/x86_64/cos.cpp
+++ b/libc/src/math/x86_64/cos.cpp
@@ -13,7 +13,7 @@
 
 LLVM_LIBC_FUNCTION(double, cos, (double x)) {
   double result;
-  __asm__ __volatile__("fcos" : "=t"(result) : "f"(x));
+  __asm__ __volatile__("fcos" : "=t"(result) : "f"(x) : "cc");
   return result;
 }
 
diff --git a/libc/src/math/x86_64/sin.cpp b/libc/src/math/x86_64/sin.cpp
--- a/libc/src/math/x86_64/sin.cpp
+++ b/libc/src/math/x86_64/sin.cpp
@@ -13,7 +13,7 @@
 
 LLVM_LIBC_FUNCTION(double, sin, (double x)) {
   double result;
-  __asm__ __volatile__("fsin" : "=t"(result) : "f"(x));
+  __asm__ __volatile__("fsin" : "=t"(result) : "f"(x) : "cc");
   return result;
 }
 
diff --git a/libc/src/math/x86_64/tan.cpp b/libc/src/math/x86_64/tan.cpp
--- a/libc/src/math/x86_64/tan.cpp
+++ b/libc/src/math/x86_64/tan.cpp
@@ -16,7 +16,7 @@
   double one;
   // The fptan instruction pushes the number 1 on to the FP stack after
   // computing tan. So, we read out the one before popping the actual result.
-  __asm__ __volatile__("fptan" : "=t"(one) : "f"(x));
+  __asm__ __volatile__("fptan" : "=t"(one) : "f"(x) : "cc");
   __asm__ __volatile__("fstpl %0" : "=m"(result));
   return result;
 }