diff --git a/clients/nested-client.c b/clients/nested-client.c
index 70bb4d1b..9ef338bb 100644
--- a/clients/nested-client.c
+++ b/clients/nested-client.c
@@ -81,7 +81,7 @@ create_shader(const char *source, GLenum shader_type)
 		char log[1000];
 		GLsizei len;
 		glGetShaderInfoLog(shader, 1000, &len, log);
-		fprintf(stderr, "Error: compiling %s: %*s\n",
+		fprintf(stderr, "Error: compiling %s: %.*s\n",
 			shader_type == GL_VERTEX_SHADER ? "vertex" : "fragment",
 			len, log);
 		return 0;
@@ -111,7 +111,7 @@ create_program(struct nested_client *client,
 		char log[1000];
 		GLsizei len;
 		glGetProgramInfoLog(client->program, 1000, &len, log);
-		fprintf(stderr, "Error: linking:\n%*s\n", len, log);
+		fprintf(stderr, "Error: linking:\n%.*s\n", len, log);
 		exit(1);
 	}
 
diff --git a/clients/simple-dmabuf-egl.c b/clients/simple-dmabuf-egl.c
index 13b00191..35a2d043 100644
--- a/clients/simple-dmabuf-egl.c
+++ b/clients/simple-dmabuf-egl.c
@@ -546,7 +546,7 @@ create_shader(const char *source, GLenum shader_type)
 		char log[1000];
 		GLsizei len;
 		glGetShaderInfoLog(shader, 1000, &len, log);
-		fprintf(stderr, "Error: compiling %s: %*s\n",
+		fprintf(stderr, "Error: compiling %s: %.*s\n",
 			shader_type == GL_VERTEX_SHADER ? "vertex" : "fragment",
 			len, log);
 		return 0;
@@ -570,7 +570,7 @@ create_and_link_program(GLuint vert, GLuint frag)
 		char log[1000];
 		GLsizei len;
 		glGetProgramInfoLog(program, 1000, &len, log);
-		fprintf(stderr, "Error: linking:\n%*s\n", len, log);
+		fprintf(stderr, "Error: linking:\n%.*s\n", len, log);
 		return 0;
 	}
 
diff --git a/clients/simple-egl.c b/clients/simple-egl.c
index 2a23166e..cd7408e9 100644
--- a/clients/simple-egl.c
+++ b/clients/simple-egl.c
@@ -243,7 +243,7 @@ create_shader(struct window *window, const char *source, GLenum shader_type)
 		char log[1000];
 		GLsizei len;
 		glGetShaderInfoLog(shader, 1000, &len, log);
-		fprintf(stderr, "Error: compiling %s: %*s\n",
+		fprintf(stderr, "Error: compiling %s: %.*s\n",
 			shader_type == GL_VERTEX_SHADER ? "vertex" : "fragment",
 			len, log);
 		exit(1);
@@ -272,7 +272,7 @@ init_gl(struct window *window)
 		char log[1000];
 		GLsizei len;
 		glGetProgramInfoLog(program, 1000, &len, log);
-		fprintf(stderr, "Error: linking:\n%*s\n", len, log);
+		fprintf(stderr, "Error: linking:\n%.*s\n", len, log);
 		exit(1);
 	}
 
diff --git a/clients/subsurfaces.c b/clients/subsurfaces.c
index 0e4e52b0..79f7ade9 100644
--- a/clients/subsurfaces.c
+++ b/clients/subsurfaces.c
@@ -296,7 +296,7 @@ create_shader(const char *source, GLenum shader_type)
 		char log[1000];
 		GLsizei len;
 		glGetShaderInfoLog(shader, 1000, &len, log);
-		fprintf(stderr, "Error: compiling %s: %*s\n",
+		fprintf(stderr, "Error: compiling %s: %.*s\n",
 			shader_type == GL_VERTEX_SHADER ? "vertex" : "fragment",
 			len, log);
 		exit(1);
@@ -325,7 +325,7 @@ triangle_init_gl(struct triangle_gl_state *trigl)
 		char log[1000];
 		GLsizei len;
 		glGetProgramInfoLog(program, 1000, &len, log);
-		fprintf(stderr, "Error: linking:\n%*s\n", len, log);
+		fprintf(stderr, "Error: linking:\n%.*s\n", len, log);
 		exit(1);
 	}