diff --git a/newlib/libm/math/wf_acos.c b/newlib/libm/math/wf_acos.c
index 15d869980..c24912de5 100644
--- a/newlib/libm/math/wf_acos.c
+++ b/newlib/libm/math/wf_acos.c
@@ -31,7 +31,7 @@
 	if(fabsf(x)>1.0f) {
 	    /* acosf(|x|>1) */
 	    errno = EDOM;
-	    return (float) nan("");
+	    return nanf("");
 	} else
 	    return z;
 #endif
diff --git a/newlib/libm/math/wf_asin.c b/newlib/libm/math/wf_asin.c
index 2f9ffaf6e..c9f15e352 100644
--- a/newlib/libm/math/wf_asin.c
+++ b/newlib/libm/math/wf_asin.c
@@ -38,7 +38,7 @@
 	if(fabsf(x)>1.0f) {
 	    /* asinf(|x|>1) */
 	    errno = EDOM;
-	    return (float)nan("");
+	    return nanf("");
 	} else
 	    return z;
 #endif
diff --git a/newlib/libm/math/wf_log.c b/newlib/libm/math/wf_log.c
index 93d1d213e..97f4a7f1a 100644
--- a/newlib/libm/math/wf_log.c
+++ b/newlib/libm/math/wf_log.c
@@ -41,7 +41,7 @@
 	} else { 
 	    /* logf(x<0) */
 	    errno = EDOM;
-	    return nan("");
+	    return nanf("");
         }
 #endif
 }
diff --git a/newlib/libm/math/wf_log10.c b/newlib/libm/math/wf_log10.c
index c9f8ecb57..529ed6514 100644
--- a/newlib/libm/math/wf_log10.c
+++ b/newlib/libm/math/wf_log10.c
@@ -41,7 +41,7 @@
 	    } else { 
 		/* log10f(x<0) */
 		errno = EDOM;
-		return nan("");
+		return nanf("");
             }
 	} else
 	    return z;