diff --git a/libc/math/lib_ceil.c b/libc/math/lib_ceil.c
index 329e20b24f..28ebf44f2f 100644
--- a/libc/math/lib_ceil.c
+++ b/libc/math/lib_ceil.c
@@ -41,8 +41,10 @@
 #ifdef CONFIG_HAVE_DOUBLE
 double ceil(double x)
 {
+  double x1 = x;
+
   modf(x, &x);
-  if (x > 0.0)
+  if (x1 > 0.0 && fabs(x1 - x) > 0.0)
     {
       x += 1.0;
     }
diff --git a/libc/math/lib_ceilf.c b/libc/math/lib_ceilf.c
index d9394bd8a1..e3af055202 100644
--- a/libc/math/lib_ceilf.c
+++ b/libc/math/lib_ceilf.c
@@ -37,8 +37,10 @@
 
 float ceilf(float x)
 {
+  float x1 = x;
+
   modff(x, &x);
-  if (x > 0.0F)
+  if (x1 > 0.0F && fabsf(x1 - x) > 0.0F)
     {
       x += 1.0F;
     }
diff --git a/libc/math/lib_ceill.c b/libc/math/lib_ceill.c
index 2e16ab73ad..14c665b5a4 100644
--- a/libc/math/lib_ceill.c
+++ b/libc/math/lib_ceill.c
@@ -41,8 +41,10 @@
 #ifdef CONFIG_HAVE_LONG_DOUBLE
 long double ceill(long double x)
 {
+  long double x1 = x;
+
   modfl(x, &x);
-  if (x > 0.0)
+  if (x1 > 0.0 && fabsl(x1 - x) > 0.0)
     {
       x += 1.0;
     }