diff --git a/common/util.c b/common/util.c
index 7602216c..243f90a8 100644
--- a/common/util.c
+++ b/common/util.c
@@ -4,6 +4,16 @@ int wrap(int i, int max) {
 	return ((i % max) + max) % max;
 }
 
+int numlen(int n) {
+	if (n >= 1000000) return 7;
+	if (n >= 100000) return 6;
+	if (n >= 10000) return 5;
+	if (n >= 1000) return 4;
+	if (n >= 100) return 3;
+	if (n >= 10) return 2;
+	return 1;
+}
+
 static struct modifier_key {
 	char *name;
 	uint32_t mod;
diff --git a/include/util.h b/include/util.h
index 7f4b3ace..dc47e343 100644
--- a/include/util.h
+++ b/include/util.h
@@ -10,6 +10,11 @@
  */
 int wrap(int i, int max);
 
+/**
+ * Count number of digits in int
+ */
+int numlen(int n);
+
 /**
  * Get modifier mask from modifier name.
  *
diff --git a/sway/commands.c b/sway/commands.c
index 58fc4aa5..9f6e5032 100644
--- a/sway/commands.c
+++ b/sway/commands.c
@@ -14,7 +14,6 @@
 #include <limits.h>
 #include <float.h>
 #include <libinput.h>
-#include <math.h>
 #include "stringop.h"
 #include "layout.h"
 #include "focus.h"
@@ -1581,7 +1580,7 @@ static struct cmd_results *cmd_bar(int argc, char **argv) {
 	int i;
 	for (i = 0; i < config->bars->length; ++i) {
 		if (bar == config->bars->items[i]) {
-			const int len = 5 + log10(i) + 1; // "bar-" + i + \0
+			const int len = 5 + numlen(i); // "bar-" + i + \0
 			bar->id = malloc(len * sizeof(char));
 			snprintf(bar->id, len, "bar-%d", i);
 			break;
diff --git a/swaygrab/CMakeLists.txt b/swaygrab/CMakeLists.txt
index 9bd06c08..9035ac8b 100644
--- a/swaygrab/CMakeLists.txt
+++ b/swaygrab/CMakeLists.txt
@@ -10,7 +10,6 @@ target_link_libraries(swaygrab
 	sway-common
 	${JSONC_LIBRARIES}
 	rt
-    m
 )
 
 install(
diff --git a/swaygrab/main.c b/swaygrab/main.c
index b944222c..82d623e7 100644
--- a/swaygrab/main.c
+++ b/swaygrab/main.c
@@ -39,7 +39,7 @@ void grab_and_apply_magick(const char *file, const char *output,
 
 	const char *fmt = "convert -depth 8 -size %dx%d+0 rgba:- -flip %s";
 	char *cmd = malloc(strlen(fmt) - 6 /*args*/
-			+ log10(width) + 1 + log10(height) + 1 + strlen(file) + 1);
+			+ numlen(width) + numlen(height) + strlen(file) + 1);
 	sprintf(cmd, fmt, width, height, file);
 
 	FILE *f = popen(cmd, "w");
@@ -72,7 +72,7 @@ void grab_and_apply_movie_magic(const char *file, const char *output,
 		"-video_size %dx%d -pixel_format argb "
 		"-i pipe:0 -r %d -vf vflip %s";
 	char *cmd = malloc(strlen(fmt) - 8 /*args*/
-			+ log10(width) + 1 + log10(height) + 1 + log10(framerate) + 1 * 2
+			+ numlen(width) + numlen(height) + numlen(framerate) * 2
 			+ strlen(file) + 1);
 	sprintf(cmd, fmt, framerate, width, height, framerate, file);