diff --git a/mk/linux/Jamrules b/mk/linux/Jamrules
index f467a9c6a..51dae7ffc 100644
--- a/mk/linux/Jamrules
+++ b/mk/linux/Jamrules
@@ -22,12 +22,12 @@ if $(USE_STLPORT_DEBUG)
 # if using streflop then add some special compiler defines
 if $(USE_STREFLOP)
 {
-   CPPFLAGS += -mfpmath=sse -msse ;
+   CPPFLAGS += -mfpmath=sse -msse -fsingle-precision-constant -frounding-math -pipe -fno-strict-aliasing -fsignaling-nans -mieee-fp ;
 }
 
 COMPILER_CFLAGS            += -Wall -W -Wno-unused -Wno-sign-compare ;
 COMPILER_CFLAGS_optimize   += -O3 -DNDEBUG ;
-COMPILER_CXXFLAGS_optimize += -O3 -DNDEBUG ;
+COMPILER_CXXFLAGS_optimize += -O -DNDEBUG ;
 COMPILER_LIBS_optimize     += ;
 COMPILER_CFLAGS_debug      += -DDEBUG -g3 ;
 COMPILER_CXXFLAGS_debug    += -DDEBUG -g3 ;