diff --git a/src/EditLexers/stlDefault.c b/src/EditLexers/stlDefault.c
index ed1c99681d..97249195a7 100644
--- a/src/EditLexers/stlDefault.c
+++ b/src/EditLexers/stlDefault.c
@@ -16,7 +16,7 @@ static EDITSTYLE Styles_Global[] = {
 	{ STYLE_CONTROLCHAR, NP2StyleX_ControlCharacter, L"size:-1" },
 	{ STYLE_INDENTGUIDE, NP2StyleX_IndentationGuide, L"fore:#FF8000" },
 	{ SCI_SETSELFORE + SCI_SETSELBACK, NP2StyleX_SelectedText, L"eolfilled; alpha:95; outline:50" },
-	{ SCI_SETWHITESPACEFORE + SCI_SETWHITESPACEBACK + SCI_SETWHITESPACESIZE, NP2StyleX_Whitespace, L"size:1; fore:#FF4000" },
+	{ SCI_SETWHITESPACEFORE + SCI_SETWHITESPACEBACK + SCI_SETWHITESPACESIZE, NP2StyleX_Whitespace, L"size:2; fore:#FF4000; alpha:51" },
 	{ SCI_SETCARETLINEBACK, NP2StyleX_CurrentLine, L"size:2; fore:#C2C0C3; back:#FFFF00; alpha:90; outline:90" },
 	{ SCI_SETCARETFORE + SCI_SETCARETWIDTH, NP2StyleX_Caret, L"back:#FF0000" },
 	{ 0, NP2StyleX_IMEIndicator, L"fore:#108010" },
@@ -39,7 +39,7 @@ static EDITSTYLE Styles_2ndGlobal[] = {
 	{ STYLE_CONTROLCHAR, NP2StyleX_ControlCharacter, L"size:-1" },
 	{ STYLE_INDENTGUIDE, NP2StyleX_IndentationGuide, L"fore:#605F63" },
 	{ SCI_SETSELFORE + SCI_SETSELBACK, NP2StyleX_SelectedText, L"eolfilled; alpha:95; outline:50" },
-	{ SCI_SETWHITESPACEFORE + SCI_SETWHITESPACEBACK + SCI_SETWHITESPACESIZE, NP2StyleX_Whitespace, L"size:1; fore:#FF4000" },
+	{ SCI_SETWHITESPACEFORE + SCI_SETWHITESPACEBACK + SCI_SETWHITESPACESIZE, NP2StyleX_Whitespace, L"size:2; fore:#FF4000; alpha:51" },
 	{ SCI_SETCARETLINEBACK, NP2StyleX_CurrentLine, L"size:2; fore:#C2C0C3; back:#FFFF00; alpha:25; outline:25" },
 	{ SCI_SETCARETFORE + SCI_SETCARETWIDTH, NP2StyleX_Caret, L"fore:#FFFFFF; back:#00FF00" },
 	{ 0, NP2StyleX_IMEIndicator, L"fore:#108010" },
diff --git a/src/SciCall.h b/src/SciCall.h
index 6def04bd38..72ac3b787c 100644
--- a/src/SciCall.h
+++ b/src/SciCall.h
@@ -549,6 +549,10 @@ NP2_inline void SciCall_SetWhitespaceBack(BOOL useSetting, COLORREF back) {
 	SciCall(SCI_SETWHITESPACEBACK, useSetting, back);
 }
 
+NP2_inline void SciCall_SetWhitespaceForeAlpha(int alpha) {
+	SciCall(SCI_SETWHITESPACEFOREALPHA, alpha, 0);
+}
+
 NP2_inline void SciCall_SetWhitespaceSize(int size) {
 	SciCall(SCI_SETWHITESPACESIZE, size, 0);
 }
diff --git a/src/Styles.c b/src/Styles.c
index 6540e46212..d9e63ffa56 100644
--- a/src/Styles.c
+++ b/src/Styles.c
@@ -1653,6 +1653,10 @@ void Style_SetLexer(PEDITLEXER pLexNew, BOOL bLexerChanged) {
 	} else {
 		SciCall_SetWhitespaceBack(FALSE, 0);
 	}
+	if (!Style_StrGetAlpha(szValue, &iValue)) {
+		iValue = SC_ALPHA_NOALPHA;
+	}
+	SciCall_SetWhitespaceForeAlpha(iValue);
 	//! end Whitespace
 
 	//! begin Caret