diff --git a/WINGs/wcolorwell.c b/WINGs/wcolorwell.c
index a5d1a1da..c67c7d0f 100644
--- a/WINGs/wcolorwell.c
+++ b/WINGs/wcolorwell.c
@@ -211,7 +211,7 @@ static void willResizeColorWell(W_ViewDelegate * self, WMView * view, unsigned i
 		if (*height < MIN_HEIGHT)
 			*height = MIN_HEIGHT;
 
-		bw = (int)((float)WMIN(*width, *height) * 0.24);
+		bw = (int)((float)WMIN(*width, *height) * 0.24F);
 
 		W_ResizeView(cPtr->colorView, *width - 2 * bw, *height - 2 * bw);
 
diff --git a/WINGs/wscroller.c b/WINGs/wscroller.c
index f1daa3a6..4a8f0273 100644
--- a/WINGs/wscroller.c
+++ b/WINGs/wscroller.c
@@ -168,10 +168,10 @@ void WMSetScrollerParameters(WMScroller * sPtr, float floatValue, float knobProp
 
 	assert(!isnan(floatValue));
 
-	if (floatValue < 0.0)
-		sPtr->floatValue = 0.0;
-	else if (floatValue > 1.0)
-		sPtr->floatValue = 1.0;
+	if (floatValue < 0.0F)
+		sPtr->floatValue = 0.0F;
+	else if (floatValue > 1.0F)
+		sPtr->floatValue = 1.0F;
 	else
 		sPtr->floatValue = floatValue;
 
@@ -180,9 +180,9 @@ void WMSetScrollerParameters(WMScroller * sPtr, float floatValue, float knobProp
 		sPtr->knobProportion = min_knob_proportion;
 		sPtr->flags.documentFullyVisible = 0;
 
-	} else if (knobProportion >= 1.0) {
+	} else if (knobProportion >= 1.0F) {
 
-		sPtr->knobProportion = 1.0;
+		sPtr->knobProportion = 1.0F;
 		sPtr->flags.documentFullyVisible = 1;
 
 	} else {
@@ -344,7 +344,7 @@ static int knobLength(Scroller * sPtr)
 		length -= 2 * (BUTTON_SIZE + 1);
 	}
 
-	tmp = (int)((float)length * sPtr->knobProportion + 0.5);
+	tmp = (int)((float)length * sPtr->knobProportion + 0.5F);
 	/* keep minimum size */
 	if (tmp < BUTTON_SIZE)
 		tmp = BUTTON_SIZE;
@@ -418,7 +418,7 @@ static void paintScroller(Scroller * sPtr)
 					       length - (int)(knobP + knobL), view->size.height - 4);
 		} else {
 			/* before */
-			if (knobP > 0.0)
+			if (knobP > 0.0F)
 				XFillRectangle(scr->display, d, scr->stippleGC,
 					       2, ofs, view->size.width - 4, (int)knobP);
 
diff --git a/WINGs/wscrollview.c b/WINGs/wscrollview.c
index a21864e5..a1b030eb 100644
--- a/WINGs/wscrollview.c
+++ b/WINGs/wscrollview.c
@@ -506,7 +506,7 @@ static void updateScrollerProportion(ScrollView * sPtr)
 
 		prop = (float)sPtr->viewport->size.width / (float)sPtr->contentView->size.width;
 
-		if (oldP < 1.0)
+		if (oldP < 1.0F)
 			value = (prop * oldV) / oldP;
 		else
 			value = 0;
@@ -518,7 +518,7 @@ static void updateScrollerProportion(ScrollView * sPtr)
 
 		prop = (float)sPtr->viewport->size.height / (float)sPtr->contentView->size.height;
 
-		if (oldP < 1.0)
+		if (oldP < 1.0F)
 			value = (prop * oldV) / oldP;
 		else
 			value = 0;
diff --git a/WPrefs.app/MouseSettings.c b/WPrefs.app/MouseSettings.c
index 6df93009..7859f147 100644
--- a/WPrefs.app/MouseSettings.c
+++ b/WPrefs.app/MouseSettings.c
@@ -298,7 +298,7 @@ static void showData(_Panel * panel)
 	sprintf(buffer, "%i", a);
 	WMSetTextFieldText(panel->threT, buffer);
 
-	WMSetSliderValue(panel->speedS, (accel - 0.25) / 0.25);
+	WMSetSliderValue(panel->speedS, (accel - 0.25F) / 0.25F);
 
 	panel->acceleration = accel;
 	sprintf(buffer, "%.2f", accel);
diff --git a/src/misc.c b/src/misc.c
index 99341d32..02aa4017 100644
--- a/src/misc.c
+++ b/src/misc.c
@@ -201,14 +201,14 @@ void slide_windows(Window wins[], int n, int from_x, int from_y, int to_x, int t
 			px = slide_steps;
 		else if (px > -slide_steps && px < 0)
 			px = -slide_steps;
-		py = (is_dx_nul ? 0.0 : px * dy / dx);
+		py = (is_dx_nul ? 0.0F : px * dy / dx);
 	} else {
 		py = dy / slide_slowdown;
 		if (py < slide_steps && py > 0)
 			py = slide_steps;
 		else if (py > -slide_steps && py < 0)
 			py = -slide_steps;
-		px = (is_dy_nul ? 0.0 : py * dx / dy);
+		px = (is_dy_nul ? 0.0F : py * dx / dy);
 	}
 
 	while (((int)x) != to_x ||
@@ -221,19 +221,19 @@ void slide_windows(Window wins[], int n, int from_x, int from_y, int to_x, int t
 			y = (float)to_y;
 
 		if (dx_is_bigger) {
-			px = px * (1.0 - 1 / (float)slide_slowdown);
+			px = px * (1.0F - 1 / (float)slide_slowdown);
 			if (px < slide_steps && px > 0)
 				px = slide_steps;
 			else if (px > -slide_steps && px < 0)
 				px = -slide_steps;
-			py = (is_dx_nul ? 0.0 : px * dy / dx);
+			py = (is_dx_nul ? 0.0F : px * dy / dx);
 		} else {
-			py = py * (1.0 - 1 / (float)slide_slowdown);
+			py = py * (1.0F - 1 / (float)slide_slowdown);
 			if (py < slide_steps && py > 0)
 				py = slide_steps;
 			else if (py > -slide_steps && py < 0)
 				py = -slide_steps;
-			px = (is_dy_nul ? 0.0 : py * dx / dy);
+			px = (is_dy_nul ? 0.0F : py * dx / dy);
 		}
 
 		for (i = 0; i < n; i++) {
diff --git a/wrlib/alpha_combine.c b/wrlib/alpha_combine.c
index b4101863..7f08a50e 100644
--- a/wrlib/alpha_combine.c
+++ b/wrlib/alpha_combine.c
@@ -47,7 +47,7 @@ void RCombineAlpha(unsigned char *d, unsigned char *s, int s_has_alpha,
 				cratio = 0;
 			} else {
 				ratio = (float)sa / alpha;
-				cratio = 1.0 - ratio;
+				cratio = 1.0F - ratio;
 			}
 
 			*d = (int)*d * cratio + (int)*s * ratio;
diff --git a/wrlib/context.c b/wrlib/context.c
index 4c40c88e..d74bf53c 100644
--- a/wrlib/context.c
+++ b/wrlib/context.c
@@ -438,7 +438,7 @@ static void gatherconfig(RContext * context, int screen_n)
 	ptr = mygetenv("WRASTER_GAMMA", screen_n);
 	if (ptr) {
 		float g1, g2, g3;
-		if (sscanf(ptr, "%f/%f/%f", &g1, &g2, &g3) != 3 || g1 <= 0.0 || g2 <= 0.0 || g3 <= 0.0) {
+		if (sscanf(ptr, "%f/%f/%f", &g1, &g2, &g3) != 3 || g1 <= 0.0F || g2 <= 0.0F || g3 <= 0.0F) {
 			printf("wrlib: invalid value(s) for gamma correction \"%s\"\n", ptr);
 		} else {
 			context->attribs->flags |= RC_GammaCorrection;
diff --git a/wrlib/rotate.c b/wrlib/rotate.c
index 482b3174..9ffaa30c 100644
--- a/wrlib/rotate.c
+++ b/wrlib/rotate.c
@@ -48,26 +48,26 @@ RImage *RRotateImage(RImage *image, float angle)
 	 * candidate for an Epsilon when trying to compare angle
 	 * to known values
 	 */
-	static const float min_usable_angle = 0.00699;
+	static const float min_usable_angle = 0.00699F;
 
 	angle = fmod(angle, 360.0);
-	if (angle < 0.0)
-		angle += 360.0;
+	if (angle < 0.0F)
+		angle += 360.0F;
 
 	if (angle < min_usable_angle) {
 		/* Rotate by 0 degree */
 		return RCloneImage(image);
 
-	} else if ((angle > 90.0 - min_usable_angle) &&
-				  (angle < 90.0 + min_usable_angle)) {
+	} else if ((angle > 90.0F - min_usable_angle) &&
+				  (angle < 90.0F + min_usable_angle)) {
 		return rotate_image_90(image);
 
-	} else if ((angle > 180.0 - min_usable_angle) &&
-				  (angle < 180.0 + min_usable_angle)) {
+	} else if ((angle > 180.0F - min_usable_angle) &&
+				  (angle < 180.0F + min_usable_angle)) {
 		return wraster_rotate_image_180(image);
 
-	} else if ((angle > 270.0 - min_usable_angle) &&
-				  (angle < 270.0 + min_usable_angle)) {
+	} else if ((angle > 270.0F - min_usable_angle) &&
+				  (angle < 270.0F + min_usable_angle)) {
 		return rotate_image_270(image);
 
 	} else {
@@ -341,8 +341,8 @@ static RImage *rotate_image_any(RImage *source, float angle)
 	int dpr, dpru, p;
 
 	/* only 180o for now */
-	if (angle > 180.0)
-		angle -= 180.0;
+	if (angle > 180.0F)
+		angle -= 180.0F;
 
 	angle = (angle * WM_PI) / 180.0;