diff --git a/konan/konan.properties b/konan/konan.properties
index 1a97fd27ed9..24d9d64fe88 100644
--- a/konan/konan.properties
+++ b/konan/konan.properties
@@ -390,10 +390,14 @@ dependencies.macos_x64-mingw_x86 = \
 
 quadruple.mingw_x86 = i686-w64-mingw32
 targetSysRoot.mingw_x86 = msys2-mingw-w64-i686-gcc-7.4.0-clang-llvm-6.0.1
-# For using with Universal Windows Platform (UWP) we need to use this slower option.
+# For using with Universal Windows Platform (UWP) we need to use slower -emulated-tls option.
 # See https://youtrack.jetbrains.com/issue/KT-27654.
 # TODO: remove, once fixed in mingw, check with the bug testcase.
-llvmLtoFlags.mingw_x86 = -emulated-tls
+# -mcpu=sandybridge makes sure that cogenerator knows which CPU flavour to emit code for.
+# Can be seen on optimized build and FP tests, where value is passed in coprocessor registers
+# by Kotlin and taken from SSE registers by C code.
+# TODO: once this information is available in function attributes, we can remove this flag.
+llvmLtoFlags.mingw_x86 = -emulated-tls -mcpu=sandybridge
 llvmLtoOptFlags.mingw_x86 = -O3 -function-sections
 llvmLtoNooptFlags.mingw_x86 = -O1
 linkerNoDebugFlags.mingw_x86 = -Wl,-S